"The guy at the tippy-top of the Bone Spire has placed the ghost wizards and skele-snakes as impenetrable hierarchical ceilings between himself and both the arcane and Bone Boi sides of the tower, respectively... Sure, those shadowmancers have proven their worthiness to enter the ranks of ghost wizards, but they're just as stuck under Galatrax's heel as the poor 'slingers, whose undead career will stagnate at bossing around femur fiends, as they can never become one of the skele-snakes above them. The magic is 'lost', but Galatrax is still the one holding the book of spells. He's still the one with the Tome of Whispers. Neither hierarchy can challenge him without similar advantages to nullify this control he can freely exert, and good luck schlepping through the barrow and the swamp to claim those when he's stolen all the magic powder from the sacred soil-- No silver shield for you, plucky young warlock!"