Collaboration Stages · Stage 10Champion of the Underground Arena地下闘技場チャンピオン200Energy Cost28,200XP Reward200,000Enemy Base HP5,000Stage Length20Max Enemies7.1Difficulty Test your team vs this stageStage rewards100% — Legendary Dumbbell ×3 · first clear50% — Legendary Dumbbell ×350% — Legendary Dumbbell ×2Enemy spawns (3)EnemyStrengthCountFirst SpawnRespawnBase HP TriggerNotesAku Doge200%73.3s26.7s~33.3s100%—Devil Wife200%56.7s33.3s~40s100%—Baki Hanma (Enemy)3500%133.3s—100%BossAll Strongest Things Alive stages