Nightmare
Level 1: ATK +10%
Level 2: ATK +10.5%
Level 3: ATK +11%
Level 4: ATK +11.5%
Level 5: ATK +12.5%
Level 6: ATK +13%
Level 7: ATK +13.5%
Level 8: ATK +14%
Level 9: ATK +14.5%
Level 10: ATK +15%