Summary:

Seeking knowledge, power, and control of a djinn, Ventress breaks the Sith spell that has been keeping Darth Vader in stasis for centuries. Finally, she can prove to Darth Tyrannus that she doesn’t need him. She can do Grown Up Sith things, like perform blood-magic.

Should have used her own blood for the ritual, though.

Or

Vader isn’t sure why there’s a war going on or why there’s an army of clone soldiers but he doesn’t really have anything better to do at the moment, anyway, so he’ll just stick around. Besides. Fives and Rex and the rest of the 501st are kinda fun? And aggravating Master Kenobi is becoming a hobby.

Or

The 501st adopts a Sith.