The Osti Multi-Strike Build centers on making Osty — the Necrobinder's summon companion — attack as many times as possible each turn. Osty operates autonomously, dealing damage on its own action without costing your Energy. By increasing Osty's attack count, attack power, and survivability through Summon-stacking cards, you create a self-sufficient damage engine that frees your hand for Block, setup, or additional effects.

• Spur: Directly increases Osty's attack frequency for the turn; the cornerstone of the multi-strike plan.
• Pull Aggro: Redirects enemy attacks toward Osty or the player strategically, protecting the more valuable target.
• Bodyguard: Skill that shields Osty from fatal hits, keeping the multi-strike engine running when under pressure.
• Capture Spirit: Generates Summon stacks that raise Osty's Max HP — more HP means Osty survives longer in extended fights.
• Friendship: Power that enhances Osty's damage or provides bonuses based on Osty's actions each turn.
• Sentry Mode: Power that synergizes with Osty's repeated attacks, generating block or other effects per hit.
• Fetch: Attack that creates synergy between player cards and Osty's actions in the same turn.

• Ivory Tile: Passively benefits from Osty's repeated attacks, producing bonuses each time Osty strikes.
• Bone Flute: Provides incremental HP or regen to Osty or the player, sustaining the engine through attrition.
• Undying Sigil: Keeps Osty in play through near-death situations, preventing the engine from shutting down mid-fight.

1. In Act 1 shops and rewards, prioritize Summon-stacking cards (Capture Spirit) to raise Osty's Max HP above the base value before Elite encounters.
2. Add Spur and other multi-strike enhancers as soon as available — each additional attack from Osty compounds with every attack buff.
3. Use Pull Aggro or Bodyguard each turn when Osty's HP drops below 50% to protect the engine from being destroyed.
4. Once Osty is durable, shift focus to attack power cards (Friendship, Sentry Mode) to multiply damage per hit.
5. Keep your own hand light on pure attacks — Osty handles the damage; your cards can focus on setup, Block, and Osty preservation.

• Highest: Summon (via Capture Spirit), Spur (multi-strike trigger)
• High: Bodyguard, Friendship (durability + damage scaling)
• Medium: Sentry Mode, Pull Aggro (utility and protection)
• Low: Generic attack cards that do not interact with Osty

• Osty dying mid-fight completely shuts down this build. Always keep an eye on Osty's HP and protect it when it drops dangerously low.
• Balancing Max HP investment vs. attack power investment is key: too fragile and Osty dies; too little attack investment and the damage is underwhelming.
• Some relics that trigger on Attack plays by the player also trigger when Osty attacks — check each relic's wording.
• In multi-enemy rooms, consider whether Pull Aggro helps Osty survive or exposes it to more damage; enemy intent matters.