Collaboration Stages · Stage 2Impregnable Fortress不落の移動要塞Data updated: 2026-07-24160Energy Cost22,560XP Reward200,000Enemy Base HP4,400Stage Length40Max Enemies6.1Difficulty Build a lineup for this stage Test your team vs this stageEnemy spawns (7)EnemyStrengthCountFirst SpawnRespawnBase HP TriggerNotesMooth800%16.7s—100%—Owlbrow200%36.7s13.3s~20s100%—Owlbrow200%∞0s30s~40s99%—Owlbrow200%30s20s99%—Blanka (Enemy)90%10s—99%—Guile (Enemy)90%10s—99%BossMs. Sign100%∞900s900s100%—All Street Fighter (Hard) stages