The Reanimated - Boss Monster (Patreon)

The figure reaches forward, collecting an oversized skull from a plinth. Each slim form in the chamber begins to seep towards the centre. She holds the skull aloft before beginning the spell.

Her gelatinous form engorges the other slime around the chamber as the demi lich at her centre warps. Its bony form changing and growing from skull to full skeleton, the oversized skull its new head. 

The slime comes up to embrace and support this now animated skeleton. It bellows loudly as the process completes. Distracted, the slime holding you and your team down weakens, and you all can move again freely. 

Can you and your party stop this newly reanimated monster? This mixture of necromancer and slime royalty?