Underground Labyrinth · Stage 31Underground B31F地底31層Data updated: 2026-07-2440Energy Cost2,256XP Reward600,000Enemy Base HP4,800Stage Length30Max Enemies9.1Difficulty Build a lineup for this stage Test your team vs this stageStage rewards50% — XP ×300,000 · Treasure RadarEnemy spawns (4)EnemyStrengthCountFirst SpawnRespawnBase HP TriggerNotesShadow Boxer K200%420s23.3s~30s100%—Doge Dark600%∞23.3s13.3s~16.7s100%—Great Angel Chibinel100%140s—100%—Doge Dark600%1090s10s~13.3s100%—All Underground Labyrinth: The Grand Deep stages