The Wardens are undead servants of the Spider Mage, resurrected guardians of the Richart prison system. They summon servants of their own to face heroes in battle.
The initial design of the Warden was a stronger skeleton foe with some sort of halberd. Working with different Halberds was fun and when we took the design to the second pass, I really wanted to match that with a fun French hat for flavor. (It was not approved). While the Skulls are foes you can face in combat regularly, the Skullion was a servant designed solely for summoning by the Warden.