“It’s the end.”

After harnessing the essence of six human SOULs, as well as the collective SOUL energy of every inhabitant of the Underground, Flowey undergoes a profound metamorphosis, emerging as his true self—Asriel Dreemurr.

Driven by his purpose to reset the course of events and wipe away all recollections of their existence, Asriel Dreemurr sets out to vanquish you, mistakenly associating you with the first human.