How do you unlock Leeching Crystal?

Upgrade the Regen Tome to Level 8. Leeching Crystal will then appear in your item pool.

What does Leeching Crystal do?

It increases Max HP by 50% but reduces HP regeneration by 50%. Effects stack, so use sparingly unless you have strong sustain.

Is Leeching Crystal required for Kevin?

Yes. Obtaining three Leeching Crystals in a single run unlocks the Kevin item.

Leeching Crystal

⭐ UNCOMMON ITEM

Effect: Increase Max HP by 50% but reduce HP Regen by 50%.
Unlocks in your item pool after Regen Tome reaches Level 8.

🛡️ Patch v1.0.17 Note

As of v1.0.17 (Oct 19, 2025), shield recharge is no longer interrupted by Leeching Crystal (or Kevin). Build advice below reflects this change.

Rarity

Uncommon

Effect

+50% Max HP; -50% Regen

Unlock

Regen Tome Lv 8

Stacks?

Yes (use sparingly)

🧪 What Leeching Crystal Does

Leeching Crystal is a high-impact survivability modifier: it massively increases your health pool while throttling your passive regeneration. If you’re browsing the full item database, think of it as a “big tank, low idle healing” switch.

Mechanics

+50% Max HP (multiplicative to your current maximum).
-50% HP Regen (applies to your total regen value).
Stacks: multiple copies further reduce regen; over-stacking can nullify sustain—pair with lifesteal or burst healing.

⚖️ Balance & Conflicts in Guides

Some older/community guides list “+50 Max HP (flat)”. Recent, widely-cited guides agree on “+50%”. This page follows the newer consensus and current patch meta.