Grak-Thar's Magical Lair

Grak-Thar, son of the Orc Warlock Grak whom the heroes dispatched in Quest 6, has become an Orc Warlock himself and seeks revenge for his father's death. Grak-Thar is experimenting with new Chaos Magic as he seeks to develop potions for his kind. He also has taken advantage of Dwarven Runes and mines to create a type of Chaos Magic more sinister than his father could have imagined. Can the heroes eliminate Grak-Thar and escape his Magical Lair where there is only one way in and out?