ESO Arcanist Class Guide: Runes, Crux, and Best Builds

The Arcanist is the magic-focused class Elder Scrolls Online added with the Necrom chapter, and it leans hard into Hermaeus Mora flavor: tentacles, glowing runes, forbidden books, the whole look. Its calling card is Fatecarver, a channeled beam you hold on a target while the damage ramps up. The class revolves around a small resource called Crux that you stack up and then spend for big payoffs. Two builds show up more than any other: a magicka DPS spamming that beam, and a tank that hides behind a wall of shields.

Arcanist Skill Lines and Core Abilities

The Arcanist has three skill lines, and each one points at a clear job.

| Skill line | Role | Signature skill | |---|---|---| | Herald of the Tome | Magic offense and DPS | Fatecarver (the beam) | | Curative Runeforms | Healing and shielding | Reconstructive Domain | | Soldier of Apocrypha | Defense and tanking | Gibbering Shield |

A DPS bar dumps its points into Herald of the Tome, but even a damage build dips into the other two lines for buffs and extra Crux sources.

Herald of the Tome

This is the headline line for a magicka DPS. The big one is Fatecarver, a channeled beam that fires in a 22 by 3 meter line and ticks damage about every 0.3 seconds on up to six enemies. The base version channels for up to 4 seconds and eats all your Crux when you cast it, adding 33% more damage for each Crux spent. Three Crux roughly triples the output. It has two morphs. Exhausting Fatecarver adds a snare and stretches the channel longer for each Crux you spend, which is handy for control. Pragmatic Fatecarver gives you a damage shield and interrupt immunity while channeling, plus it cuts the cost 16% for each Crux. Most DPS run Pragmatic, because standing still for four seconds with no shield is a quick way to get smacked.

Runeblades is your cheap spammable, generating a Crux and adding 3% damage for each Crux you hold. Its Escalating Runeblades morph is the one DPS bars run. Abyssal Impact is a cone that immobilizes enemies and marks them with Abyssal Ink for 5% more damage taken. Its morph Cephaliarch's Flail is the premier Crux builder, and it heals you the first time it hits an enemy on each cast. The other morph, Tentacular Dread, flips it into a spender that chews all your Crux for bonus damage.

The Imperfect Ring drops a ground rune that deals damage over time, and its Fulminating Rune morph detonates after six seconds for an extra burst. Tome-Bearer's Inspiration is a self-buff that grants Major Sorcery and Major Prophecy, and it hands you a Crux if you're at zero. The line's ultimate is The Unblinking Eye, which summons a Hermaeus Mora scion that fires its own beam for six seconds. Its The Tide King's Gaze morph makes the beam track a target and last longer, and The Languid Eye ramps the damage over time, which is the single-target pick most DPS run.

Curative Runeforms

This is healer territory, but a few skills show up on non-healer bars. Runemend is an instant three-hit heal that builds a Crux and costs less for each Crux you hold. Arcanist's Domain lays down a vortex granting Minor Courage (a flat +215 weapon and spell damage) plus better recovery to anyone in it. Its Reconstructive Domain morph also heals the group standing in the zone, which is the "big healing bubble" people talk about. Apocryphal Gate drops portals you teleport between, generating a Crux per hop. The ultimate, Vitalizing Glyphic, summons a glyphic you heal up to power a damage and healing aura.

Soldier of Apocrypha

This is what makes an Arcanist tanky. Runic Jolt is a ranged taunt that generates a Crux, applies Minor Maim (the target does 5% less damage), and while it's slotted you take 2% less damage for each Crux you hold. Its Runic Sunder morph is the tank taunt of choice. Fatewoven Armor grants Major Resolve (a big armor boost), and the Cruxweaver Armor morph generates a Crux when you get hit. Rune of Eldritch Horror is the line's big debuff: it stuns and applies Minor Vulnerability, so the target takes 5% more damage from everything for several seconds. Its Rune of the Colorless Pool morph also adds Minor Brittle, bumping crit damage taken by 10%, a big deal for a crit-heavy group. The ultimate, Gibbering Shield, absorbs up to 60% of incoming damage and then throws it back at nearby enemies. The Gibbering Shelter morph trades the damage for shielding nearby allies when you get hit, which is the group-protection pick.

Understanding the Crux Resource System

Crux is the engine that makes the Arcanist tick. You see it as up to three glowing green triangles orbiting your character, and everyone else can see them too. The cap is three. Generating more does nothing, and a couple of passives that fire on Crux generation won't trigger while you're already maxed.

Here's the catch. Crux only builds in combat. Outside of a fight the generation skills do nothing, and any Crux you're holding expires after about 30 seconds. So you can't pre-stack it before pulling a boss.

Building Crux

A bunch of skills hand you one Crux per cast:

• Runeblades and its morphs
• Runemend and its morphs
• Cephaliarch's Flail (the Abyssal Impact morph)
• Chakram of Destiny (the Chakram Shields morph)
• Cruxweaver Armor when you take a hit
• Runic Jolt and its morphs
• Apocryphal Gate on each teleport
• Tome-Bearer's Inspiration, but only if you're at zero Crux

That last one is a fun detail. Tome-Bearer's Inspiration only coughs up a Crux if you have none, so it's more of a "get off zero" button than a builder you spam. Skills you craft with the Class Flourish Scribing script (added in the Gold Road chapter) can also generate Crux.

Spending Crux

Spenders eat all your Crux at once, with the effect scaling per Crux spent. That's the whole game: stack to three, then dump.

• Fatecarver adds 33% beam damage per Crux, so three Crux is roughly +99%
• Tentacular Dread adds 33% base damage per Crux
• Remedy Cascade restores magicka and stamina to allies for each Crux
• Unbreakable Fate adds 5% block mitigation per Crux, up to 20% at three
• Runespite Ward heals you for a chunk per Crux

Passives that ride on Crux

A few passives fire whenever you generate or spend Crux:

• Fated Fortune (Herald) bumps your crit damage and crit healing for several seconds whenever you generate or consume Crux
• Hideous Clarity (Curative) restores magicka and stamina every time you generate Crux
• Healing Tides (Curative) adds healing done for each Crux you hold
• Implacable Outcome (Soldier) grants ultimate when you spend Crux

The practical takeaway: build to three before you fire a spender. A Fatecarver at one Crux is weak. A Fatecarver at three is the whole reason you picked the class.

Best Race and Mundus Stone Pairings

Magicka DPS races

The long-running top pick is High Elf (Altmer), and the math backs it up. Altmer get +2000 Max Magicka, +258 weapon and spell damage, and a passive called Spell Recharge that restores 625 magicka or stamina every six seconds when you cast. The sneaky-good part: Altmer also take 5% less damage while channeling or casting, and since Fatecarver is a four-second channel, that survivability adds up.

| Race | Key perk | When to pick it | |---|---|---| | High Elf (Altmer) | +2000 Max Magicka, +258 Spell Damage, 5% less damage while channeling | The default best pick | | Breton | -7% ability cost, +130 Magicka Recovery | If you run dry on magicka | | Dark Elf (Dunmer) | +1910 Magicka and Stamina, +258 Spell Damage | If you want hybrid flexibility | | Khajiit | +12% Critical Damage | If you're stacking crit |

Breton is the sustain pick, since that flat 7% cost cut on every ability adds up over a long fight. Dark Elf ties Altmer for spell damage and splits its stats across both pools, handy if you ever swap to a stamina build. Khajiit leans on crit damage and pairs with the Thief Mundus.

Tank races

For a tank, Nord is the standard answer. Nords get +2600 to both physical and spell resistance (the biggest resistance passive in the game, basically a free armor set), +1000 Max Health, +1500 Max Stamina, and 5 ultimate whenever you take damage, once every 10 seconds. Since a tank is always getting hit, that's a steady drip of ultimate for group-saving cooldowns.

| Race | Key perk | When to pick it | |---|---|---| | Nord | +2600 both resistances, +5 Ultimate when hit | The default tank pick | | Argonian | Potions restore 3125 Health, Magicka, and Stamina | For long fights where sustain matters | | Imperial | +2000 Health, +2000 Stamina | Raw health and stamina pool |

Argonian is the close second, and the reason is the potion restore. Every time you drink a potion you get a big chunk of all three resources back, which keeps a tank alive on long trial fights where you'd otherwise dry out.

Mundus stones

For a magicka DPS, The Thief is the common pick. It bumps spell critical (about +1212 at base, more with Divines-trait armor), and more crits mean more damage. The Mage (max magicka) and The Apprentice (spell damage) are the fallbacks if your gear already covers crit.

For a tank, The Lord adds max health and is the safe default. If you don't need it, The Lady (resistances) and The Atronach (magicka recovery) are the swaps.

Attributes

A magicka DPS dumps everything into magicka, all 64 points. It's a squishy, glass-cannon setup, and you lean on the class shields to stay alive. A tank splits it up more than you'd expect: something like 20 magicka, 20 health, and 24 stamina. The trick is keeping stamina higher than magicka, because synergies you pick up return whichever resource is higher, and stamina is what you burn on blocking.

One footnote: Arcanist skills scale off whichever of magicka or stamina is higher, so a stamina Arcanist works fine too. Magicka is just the more common pick, since the class leans magic.

Recommended Gear Sets for DPS and Tank Arcanist

Magicka DPS gear

If you're just starting out, the easy win is a pair of sets you can buy or make without touching a trial. Law of Julianos is craftable, so it's cheap as dirt on guild traders, and it gives a reliable mix of crit and spell damage. Pair it with Mother's Sorrow, an overland set from Deshaan that bumps your crit by a big chunk on the five-piece (about 1528 crit). Round it out with a two-piece monster set like Maw of the Infernal (The Banished Cells II), which summons a daedra to add extra damage.

Once you're farming dungeons and trials you can step up. Pillar of Nirn (Falkreath Hold dungeon) adds a bleed proc that scales off your higher damage stat, so it works on a magicka build. Ansuul's Torment (Sanity's Edge trial) grants Minor Slayer for 5% more damage to dungeon and trial monsters and ramps after interrupts.

| Set | Source | What it does | |---|---|---| | Law of Julianos | Crafted | All-round crit and spell damage, easy to get | | Mother's Sorrow | Deshaan overland | Big crit bonus on the five-piece | | Pillar of Nirn | Falkreath Hold dungeon | Bleed proc that scales off your higher damage stat | | Ansuul's Torment | Sanity's Edge trial | Minor Slayer, ramps after interrupts | | Whorl of the Depths | Dreadsail Reef trial | Minor Slayer plus a damage proc |

The current high-end setup leans on Perfected Whorl of the Depths (Dreadsail Reef trial) for the Minor Slayer slot and a damage proc, paired with Tide-Born Wildstalker, a craftable set that boosts your direct damage (and Fatecarver counts as direct damage). A lot of top setups also run the Velothi Ur-Mage's Amulet mythic for a big damage bump, though it does cut your light and heavy attack damage as a tradeoff. For the monster slot, one piece of Slimecraw for the crit bonus is common, or just stick with two pieces of Maw of the Infernal.

Skip the Oakensoul mythic for a beam build. It locks you to a single bar, and Fatecarver wants a destruction staff back bar with the Crushing Wall maelstrom weapon, so Oakensoul guts the build.

Tank gear

A classic Arcanist tank setup runs Tormentor (The Banished Cells) as its centerpiece. Its five-piece taunts enemies for 15 seconds whenever you hit them with a charge, blink, leap, or pull, which fits Arcanist charge skills. Stack it with Ebon Armory (Crypt of Hearts) to give the group +1000 Max Health, and Claw of Yolnahkriin (Sunspire trial) to grant Minor Courage (+215 weapon and spell damage) every time you taunt. For the monster set, Lord Warden or Tremorscale are the usual picks.

| Set | Source | What it does | |---|---|---| | Tormentor | Banished Cells dungeon | Charge or blink taunts enemies | | Ebon Armory | Crypt of Hearts dungeon | +1000 Max Health to your group | | Claw of Yolnahkriin | Sunspire trial | Minor Courage to the group on taunt | | Turning Tide | Shipwright's Regret dungeon | Applies Major Vulnerability | | Nazaray | vShipwright's Regret monster | Extends Major Vulnerability on ultimate use |

The current meta ceiling for tanks is the Turning Tide and Nazaray combo. Turning Tide (Shipwright's Regret dungeon) applies Major Vulnerability, which makes the whole group do more damage to whatever you're tanking. Nazaray, the monster set from the veteran version of that same dungeon, extends that Major Vulnerability every time you pop an ultimate. Run the two together and the debuff stays up almost permanently.

Rotation Tips for Beam and Herald Abilities

The beam: Pragmatic Fatecarver

The beam is what a magicka Arcanist is known for, and Pragmatic Fatecarver is the morph most DPS run. The version that matters: a four-second channel that ticks every 0.3 seconds, hits up to six enemies, and adds 33% damage per Crux spent, so three Crux is nearly +99%. The Pragmatic morph wraps you in a damage shield and makes you immune to interrupts while channeling, and it trims the cost 16% per Crux. That shield is the whole reason it's the pick, because four seconds of standing still with no defense is asking to get smacked.

The other morph, Exhausting Fatecarver, trades the shield for a snare and stretches the channel longer for each Crux you spend. It's more about control than survival. In organized content with a healer babysitting you, Exhausting can work. For most people running solo or in pugs, Pragmatic is safer, which is why it's the default.

Build to three before you fire

The single biggest mistake new Arcanists make is firing the beam at one or two Crux instead of three. Spend a couple of globals building to three first, then unleash it. The damage difference between a one-Crux beam and a three-Crux beam is enormous.

Your builders in the rotation are usually Escalating Runeblades (a good cheap spammable that also adds damage for each Crux you hold) and Cephaliarch's Flail (which heals you and inks the target so it takes more damage). While you're building, keep your damage-over-time effects rolling: Wall of Elements on the back bar, Fulminating Rune on the ground. Those keep ticking while you set up the beam.

Light attack weave

Like every damage build in the game, you light attack between every ability. The rhythm is light attack, ability, light attack, ability. It sounds tedious, but it's a big chunk of your damage and keeps the light-attack-triggered set bonuses firing. The beam itself is a channel, so you fire it once and hold, with no weaving during it.

Keep the Herald debuffs up

The Herald line has a couple of debuffs worth keeping up. Cephaliarch's Flail inks targets for 5% more damage taken, easy to maintain since you cast Flail to build Crux anyway. The bigger one is Minor Vulnerability, another 5% damage taken. If your tank runs Rune of Eldritch Horror, they cover it for the group. If not, slot it and apply it yourself before you beam.

Mind your resources

The beam eats magicka fast, especially when you refresh it over and over. Tome-Bearer's Inspiration (your Major Sorcery buff) and a Spell-Power Potion help keep your damage stats up, and Altmer's Spell Recharge or Breton's cost cut earn their keep here. If you run dry, lean on a builder round or pop a potion before the next beam.

Tank rotation

For a tank, the rotation is less about a damage sequence and more about keeping taunts, debuffs, and shields rolling. Open with Runic Sunder to taunt (it generates a Crux and applies Minor Maim). Stack your Soldier of Apocrypha defenses: Unbreakable Fate for +20% block mitigation at three Crux, Runeguard of Freedom for Major Resolve and an emergency heal when you drop below 50% health, and hold block on a frost staff back bar. When the group takes a big hit, pop Gibbering Shelter to absorb it and shield nearby allies. Keep Aggressive Warhorn on cooldown for the group damage and resource buffs.

The clean loop: taunt with Runic Sunder, build to three Crux, dump into Unbreakable Fate for the mitigation, refresh your debuffs, and hold the line with Gibbering Shelter when something scary is coming. Crux on a tank isn't about a damage burst. It's about turning that resource into staying alive.