Ghast

The cliff-ghast wrenched off the fox's head, and fought his brothers for the entrails.

The most powerful of all undead creatures, ghasts feed on ghosts, dead souls and, most especially, live ones. They want to take over Iltior and set up a ghast empire.

A malamanteau, or malapropistically used neologism that is also a portmanteau (yeah, isn't that a conceptual mouthful), the ghast was an incidental combination of ghost and ghastly […] As the post-interview continued, Carlos and I laughed as we recognized his malamanteau, what he chucklingly redescribed as a "ghastly ghost" […] "Ghast" is a neologism and portmanteau of ghost and ghastly that was used malapropistically. This, thus, constitutes a malamanteau.