Collaboration Stages · Stage 1A City Aflame (Insane)都炎上 超激ムズ1★ 100%2★ 150%3★ 200%4★ 200%Data updated: 2026-07-24150Energy Cost21,150XP Reward900,000Enemy Base HP5,200Stage Length5Max Enemies7.2Difficulty Build a lineup for this stage Test your team vs this stageStage rewards100% — Healer · first clearEnemy spawns (13)EnemyStrengthCountFirst SpawnRespawnBase HP TriggerNotesDoge Dark200%103.3s5.3s~16.7s100%—Rei (Enemy)400%240s6.7s100%—Wyvern (Enemy)100%10.1s—50%—Rei (Enemy)100%10.1s—50%—Fuu (Enemy)400%∞126.7s40s~53.3s100%—Serum (Enemy)600%∞6.7s30s~36.7s100%—Rei (Enemy)400%∞113.3s30s~43.3s100%—Rei (Enemy)400%3113.3s0.1s~1.3s100%—Serum (Enemy)600%3113.3s0.7s~3.3s100%—Wyvern (Enemy)100%140s—100%—Wyvern (Enemy)100%1120s—100%—Healer (Enemy)400%1113.3s—100%BossMs. Sign1200%∞900s900s100%—All Merc Storia: Inferno stages