Building a warlock NPC bad guy - need some help

[StreamOfTheSky]

But Flee the Scene cannot be used for escaping from grapple. It has, like all the other invocations, somatic component.

Yeah, that's true. I forgot, it was our houserule to ignore somatic components for that one since it's mimicing DDoor, and that spell loses most of its usage if you can't even freaking use it to escape a grapple.