Solak

Solak is a creature of the anima mundi and guardian of Guthix who defends the lost Grove from those who want its power. Back in the second Age, Seren had sent a group of elite elf warriors to help in this divine task, with betrayal leading to one of those elves being consumed by Solak and the island disappearing into the mists of time. Four ages have passed since that fateful fight, with Solak now both guardian and twisted elf spirit. Your job is to split that infectious, mental parasite and restore Solak.. Solak is mentioned in Runefest 2017 and is said to be the toughest boss monster yet, requiring a group of seven to fight it.

History
Not much is known about Solak, only that he is a creature of the anima mundi like Vorago and Telos. Solak is tasked in protecting an island that inhabits smaller creatures of the anima mundi. Guthix at one point had appointed Solak as a Guardian of Guthix. During the second age Seren had sent a group of elite elf warriors, with one ending up betraying Solak who consumed one of them. The island was untouched until the fifth year of the sixth.