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Osty Pet Build

A Tier
NecrobinderHard

Center the run on Osty with companion attacks, buffs, and summon support.

Playstyle

Turn Osty into the center of the run with attack buffs, support tools, and summon payoffs.

Win Condition

Keep Osty active and buffed so companion attacks handle both offense and frontline defense.

Pros

  • Strong companion-based pressure
  • Distinct damage source outside your hand
  • Can snowball once Osty is protected

Cons

  • More fragile when Osty is offline
  • Needs careful setup
  • Harder to pilot than straight Doom builds

Core Cards

Calcify
1×1
Calcify
Fetch
0×1
Fetch
Protector
1×1
Protector
Bone Shards
1×1
Bone Shards
Necro Mastery
2×1
Necro Mastery

Tags

ostypetsummon

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Reaper Form BuildA Tier

Transform into the Reaper and overwhelm fights with aggressive lifesteal attacks, AoE harvests, and relentless pressure.

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Video Tutorial

HUGE DAMAGE Necrobinder Osty Build! Ascension 8 GAMING! (Slay The Spire 2)

Watch on YouTube