Appearances of Inevitables

[DCCCV]

I seem to recall reading in one of the APs that there was an Inevitable in stasis that when awakened, would try to kill all the descendants of a dark sorcerer.

I can't remember which book that was in. Could someone help me?

[Tarik Blackhands]

The Sound of a Thousand Screams (Kingmaker 6) evidently has that Inevitable as part of a certain dragon's loot horde

[DCCCV]

Thank you!