Grimtok was the ruler of Gundabad during the War of the Last Alliance. Under the guidance of Storlaga and at the behest of Sauron, Grimtok rallied hordes of orcs in the Misty Mountains for an assault on the Entwife Gardens. Accompanied by the orc chieftains and dragons. Grimtok led the assault on the Entwife Gardens, but was met with opposition from the Northmen of Rhovania. Though Grimtok's forces did help succeed in destroying the Gardens, the Last Alliance had made its way over the mountains and Grimtok's forces fled back from whence they came.