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Yoku is the core in-run resource of dungeons in Soulbound: Online. It powers the relic system inside a run, and it is also the energy you spend to claim dungeon rewards.

Yoku And Relics

As you defeat enemies and complete objectives in a dungeon, Yoku crystals drop and fill your relic experience bar. Each time the bar fills, you choose one of three relics to add to your build. In this sense Yoku is the relic experience of a run: more Yoku means more relic picks and deeper synergies before the run ends.

Yoku Energy And Chests

Claiming a dungeon's reward chest costs Yoku energy, shown as a blue bar beneath your energy meter. Higher dungeon tiers cost more Yoku per chest, so Yoku acts as a soft daily limit on how many high-tier rewards you can bank. In the live build, players receive a free allotment of 800 Yoku each day, and contracts can grant additional Yoku when you need more to keep opening chests.

Refining Yoku

Rare Yoku can be refined at the Chemistry Lab among your crafting stations, tying the dungeon resource back into base crafting and the wider economy.

Yoku amounts and the daily allotment are drawn from the live browser build and the studio's dev updates, and may be tuned during Early Access.