This is after part 1 and 2. Story: You killed Beast.EXE.?1 and got too much power. You decide to go to the Endless Breath portal and you find him. Phase 1: Intermediate Phase 2: Never-ending Slaughter Phase 3: Pure Power Phase 4: Untold Nightmares Phase 5: Worst Bad Time Phase 6: Unpredictable Phase 7: Meltdown Phase 8: Chaotic Revenge Phase 9: Gaster's Revenge Phase 10: Untold Destruction
Credit to whoever made music.
