Theostones (Weapon only)

Theostones engrave into a weapon’s single Theostone slot and give it an on-hit proc. You pick the stone, so nothing is rolled.

Their contribution to damage is negligible, under 1% of your total even at Unique grade. Each one also puts a colored glow on the weapon, so most players pick whichever proc looks best rather than chasing numbers. Engraved theostones are lost when you transfer gear.

Types

One slot per weapon, and only on Legend grade and above. The offhand Guard counts as a weapon, so a shield user runs two procs at once.

Slot	Grade	Theostone slots
Weapon	Common, Rare	0
Weapon	Legend, Unique, Heroic	1
Guard	Legend, Unique, Heroic	1

Seventeen effects, each sold in three grades. The grade changes only the size of the number, never the proc chance, and the same effect never stacks with itself.

Grade	What it changes
Rare	weakest value
Legend	middle value
Unique	strongest value

Available effects

Seven debuff procs, all on a 5 second activation cooldown (cut from 15s in the 2026-08-26 TW patch). Only the duration scales.

Effect	Proc	Rare	Legend	Unique
Blind	3%	Kaisinel’s Vestige 5s	Bollvig’s Tragedy 6s	Fregion’s Schemes 7s
Combat Speed −50%	3%	Notun’s Craft 5s	Io’s Sadness 6s	Lumiel’s Interference 7s
Move Speed −50%	3%	Reda’s Tenacity 5s	Deltras’s Loyalty 6s	Kaisinel’s Reverie 7s
Paralyze	2%	Nua’s Scheme 2s	Vidar’s Dignity 3s	Ereshkigal’s Honor 4s
Root	2%	Heladrir’s Chains 3s	Charna’s Root 4s	Nezekan’s March 5s
Seal	3%	Perion’s Tragedy 3s	Khrudgelmir’s Silence 4s	Beritra’s Conspiracy 5s
Stun	3%	Aulak’s Roar 1s	Fasimedes’s Dignity 2s	Meslamtaeda’s Greed 3s

Ten damage procs, all on a 1 second activation cooldown except Rathman’s Greed, which is 5 seconds. Damage is a flat number and does not scale with your attack.

Effect	Proc	Rare	Legend	Unique
Poison, every 2s for 20s	5%	Santras’s Secret 300	Orissan’s Blood 450	Zikel’s Arrogance 600
Bleed, every 2s for 10s	3%	Feruk’s Instinct 400	Mahisha’s Wrath 600	Fregion’s Strategy 800
Fire, single target	1%	Zikel’s Vestige 5,000	Traufnir’s Courage 10,000	Tiamat’s Rage 15,000
Water, single target	2%	Tassin’s Command 2,500	Sif’s Knowledge 5,000	Triniel’s Rationality 7,500
Earth, single target	5%	Ulgorn’s Will 1,000	Freyr’s Wisdom 2,000	Vaizel’s Oath 3,000
Wind, single target	10%	Aultross’s Promise 500	Sigyn’s Brilliance 1,000	Meslamtaeda’s Regret 1,500
Fire, up to 4 targets	2%	Bargott’s Ember 1,250	Boreas’s Encouragement 2,500	Tiamat’s Counterstrike 3,750
Water, up to 4 targets	4%	Aulvicar’s Sorcery 625	Charna’s Acumen 1,250	Marchutan’s Justice 1,875
Earth, up to 4 targets	10%	Gartua’s Strength 250	Thrasymedes’s Wisdom 500	Yustiel’s Compassion 750
Wind, up to 4 targets	20%	Rathman’s Greed 125	Jumentis’s Dexterity 250	Beritra’s Selfishness 375

Within a group the proc chance and the damage always cancel out: every Unique single target stone averages 150 damage per swing, and every Unique area stone 75 per target. Picking Wind over Water buys frequent small hits instead of rare large ones, never more damage, so choose on how it feels and how it looks.

How to obtain

Grade	How to get it
Rare	Abyss Shop: Rare Theostone Chest, 35,000 AP Transcendence trial box Sanctuary raid, reward pool 4 Hidden open-world cubes
Legend	Transcendence trial box, later stages Sanctuary raid, reward pool 4 Combine from Rare
Unique	Combine from Legend

Sanctuary’s theostone pool runs roughly 89% Rare to 11% Legend. Combine merges lower grades upward for a chance at the next grade, the way the Closet combines skins, rather than at a fixed rate.

No Unique theostone appears anywhere in the captured drop tables, which cover 36 dungeon and tier combinations, so combining looks like the only route to one. Those captures do not cover Abyss sieges, corridors or rifts, so treat this as unconfirmed rather than settled.