Collaboration Stages · Stage 4I Have No Regrets後悔なんてあるわけない1★ 100%2★ 150%3★ 200%Data updated: 2026-07-24250Energy Cost214,320XP Reward480,000Enemy Base HP4,500Stage Length10Max Enemies8.1Difficulty Build a lineup for this stage Test your team vs this stageStage rewards100% — XP ×600,000 · first clear20% — XP ×300,000Enemy spawns (6)EnemyStrengthCountFirst SpawnRespawnBase HP TriggerNotesOne Horn1800%30s10s100%—Ginger Snache200%∞33.3s20s~30s100%—Ginger Snache200%150.1s6.7s~10s99%—Bore200%20.1s50s99%—Box Witch and Minions300%10.1s—99%BossMs. Sign100%∞900s900s100%—All Witch's Labyrinth: Box Witch stages