Bone Brew

Bone Brew

UncommonNecrobinderDrink
Summon 15.

Summons Osty with 15 HP if he is not on the field, or raises his Max HP by 15 and heals him 15 if he already is. While Osty lives, every unblocked attack aimed at you hits him instead, so those 15 points are a wall between you and enemy damage. It is a Necrobinder potion and does nothing for other characters.

Use
DrinkSelf only
When
In combat
Rarity
Uncommon25% of random potions
Character
Shop price
75 gold
Unlock
SpirebornBeat Act 3 with the Necrobinder

When to take Bone Brew

Drink it when Osty is dead and a big attack is coming, or top him up before a card that spends him, like Bone Shards, for an emergency wall.

Unlocked by the Spireborn epoch

Beat Act 3 with the Necrobinder

Other Necrobinder potions

Changes by version

  1. 15 Jan 2026Summon1015Internal playtest
    Summon increased from 10 to 15
  2. 20 Jun 2025Bug fixInternal playtest
    Fixed Bone Brew potion description text
  3. 29 May 2025TextInternal playtest
    Necro Milk to Bone Brew

Internal playtest notes are from before the Early Access release. Names and numbers in them can differ from the game today.

Purchase today
If you haven't bought Slay The Spire 2 yet, it's time. Support the devs, they made an amazing game.Get it on Steam