In the NIdavellir section of Grizzleheim where you fight the 3 brothers. Those 3 Brothers I feel would make for a good Wood, Stone and Gold Key bosses. Would also be a way to give them more current spells and different Cheats. This could also be an additional way to earn Dropped Spells and Spellaments. Perhpas even have them drop Teleporters, Mini Games and Mannequins.