Icelus

Icelus, one of the Oneroi, Greek gods of Dreams. He embodied Nightmare.
Member of The House Of Erebus.
Brother of Phantasos and Morpheus.
First seen in Season 1.
The Oneroi were sent to attack Clearwater and Fionn Corvin, their assuault via the medium of Dreams.
Icelus plunged Clearwater into a Horror movie setting.
He was killed by Fionn Corvin on fight on a merry-go-round in an abandoned playground.