ネクロバインダー

• Type: Attack
• Cost: 2
• Effect: Osti deals 11 damage. Apply 2 Weak to all enemies.

A 2-cost Osti Attack that fires 11 damage into a single target while slapping 2 Weak onto every enemy. The AoE Weak 2 (25% attack reduction on all hits) is incredibly valuable in multi-enemy rooms and acts as a defensive tool in trash fights.

With Bone Enhancement (+4 Osti damage), the hit becomes 11+4 = 15, turning it into a respectable 2-cost Attack as well. Paired with a debuff-heavy deck, you can pre-load Debilitation (Weak doubled) and then fire High Five for effectively AoE Weak 4. It also feeds Misery (spread one enemy's debuffs to all). As an Osti Attack it combos with every Osti synergy — Go Get'em (Osti attack grants Summon), Crush (Osti already-attacked = 0 cost), Rattle (double Osti attack count), and so on.

Rating: B-tier (unique AoE Weak Osti Attack, shines in multi-enemy fights)

• Prioritize in multi-enemy fights to maximize the AoE Weak 2
• Pre-play Debilitation so the Weak lands doubled as effective Weak 4
• Each High Five counts as an Osti Attack — feeds Rattle's attack counter too
• With Bone Enhancement, a 2-cost 15 damage + AoE Weak 2 becomes a great tempo play

• Debilitation: doubles Weak duration for 3 turns — High Five's AoE Weak becomes effectively 4
• Bone Enhancement: +4 Osti damage. High Five hits for 15 and cost efficiency jumps
• Misery: spread single-target debuff to all. Build Weak on one enemy, then spread it
• Go Get'em: Summon 2-3 every Osti attack. High Five triggers this too
• Crush: 0-cost if Osti already attacked. Play Crush for free after High Five

• Necrobinder Osti Multi-Attack Build (S-tier)