Slay the Spire 2 Ten-Thousand HP Osty — The Hand Wall Build

Published 2026-03-09Updated 2026-09-196 min read

Max out Osty's HP and let him tank, swing and mirror damage in Slay the Spire 2: Bodyguard and Sic 'Em scale the hand, Necro Mastery mirrors his health bar, and Squeeze cashes it in.

The ten-thousand HP hand is the Necrobinder's answer to being fragile: instead of fixing her 66 HP, grow Osty into a wall with a health bar the boss cannot chew through — then mirror that bar back at the enemy team. Osty tanks, Osty swings, and the lich scrolls her deck behind him.

Osty, the Necrobinder's summoned hand in Slay the Spire 2
Your left hand has more HP than the entire enemy team. This is fine.

The scaling package

  • Bodyguard (Basic, 1) — Summon 5 (7). Your starter's worth finally explained: every Summon stack is an Osty HP point, and this is the first.
  • Sic 'Em (Uncommon, 1) — Osty deals 5 (6) damage, and whenever Osty hits that enemy this turn, Summon 3 (4). Attack turns now feed the health pool.
  • Devour Life (Rare Power) — every Soul played Summons 1 (2). Pairs with the soul engine; production turns become scaling turns.
  • Necro Mastery (Rare Power, 2) — Summon 5 (8), and whenever Osty loses HP, ALL enemies lose that much too. The build's thesis statement: hitting the hand is now a team-wide tax.

The cash-out attacks

  • Squeeze (Rare, 3) — Osty deals 25 (30) damage, plus 5 (6) for each of your other Osty attacks this turn. The "one punch" finisher: with the hand scaled and a few cheap swings first, this deletes bosses.
  • Snap (Common, 1) — Osty deals 7 (10) damage and adds Retain to a card in hand. Cheap, scaling, and hand-quality in one.
  • Reap (Common, 3) — Retain; deal 27 (33) damage. The biggest common attack in the game — hold it, fire it, win the trade war.

The defensive shell

  • Bone Flute — 2 Block whenever Osty attacks. His aggression is your shield.
  • Sentry Mode (Rare Power) — adds a recurring utility card to your hand each turn; upgrade priority for consistency.
  • Death's Door / Shroud from the Doom package slot in cleanly if rewards offer them — this deck has room for one engine only, but never for zero walls.

Turn template

  1. Scale early: Bodyguard, Sic 'Em, Devour Life turns — every Summon stack is permanent until Osty falls, and he revives every turn with Bound Phylactery anyway.
  2. Park him in front: enemies that attack the frontmost target bleed into Osty's pool; Necro Mastery reflects it.
  3. Cash: once the pool is monstrous, Squeeze (fed by Snap swings) lands for the whole ledger.

The build's rule is patience: Osty's HP is cumulative equity, and every defensive turn is a deposit. Enemies swing the hand, the hand grows, and eventually the lich does not even need to block — the tanky left hand is the deck.

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