Monster

Monster is the main antagonist of What A Big Adventure. He was a 600 year old deity of Monsters in 1000.

Biography
In 1000, he was the king of Monster Kingdom. All the monsters worshipped him until, a mob came destroying the place and he managed to hide away from the terror.

600 years later, he re-emerged again and attempted to kill Timothy. However, his plot failed and he was knocked out by the hero. After he escaped, he remains in the Forest, doomed eternally to patrol the area.

Afterlife
Dealite the monster being doomed eternally, it could be that he committed suicide or fled from the forest after realising his insanity.