Underground Labyrinth · Stage 53Underground B53F地底53層40Energy Cost2,256XP Reward600,000Enemy Base HP4,600Stage Length3Max Enemies9.1Difficulty Test your team vs this stageStage rewards50% — XP ×300,000 · Treasure RadarEnemy spawns (3)EnemyStrengthCountFirst SpawnRespawnBase HP TriggerNotesMetal Hippoe200%416.7s33.3s~36.7s100%—I.M. Phace800%130s—100%BossMetal Hippoe200%270s16.7s~20s100%—All Underground Labyrinth: The Grand Deep stages