The Summoner is a fan made antagonist on Abandoned: Discovery Island.
He appears to be a red, ghostly figure wearing a red, hooded robe with claws and no eyes and a mouth with big, sharp teeth.. He also has no legs as it's covered by the robe and he can float.
He starts at night 4 and can appear in the Office out of nowhere. When seen, the player must hide or he will summon a random toon or humanoid into your office and then vanishes.
He can only appear in the office.
It's currently known about his backstory.
He's one of the few enemies to summon toon's, other being God.