How impressive is Thon's Ambria feat?

How does it compare to the ziost drain by Vitiate, Nihilus's planet drains, Sidious's Byss feat or any other planet scale feats you can think of?

THON.

Well, Thon's less powerful than all those characters, so his feat is evidently not as impressive as any of theirs.

It's pretty damn impressive, imo. The Dark Side energies threatened to consume the entire sector, not just the planet itself; and Thon managed to seal all of it into a measly lake, then hold it there indefinitely.

Feat can be argued to be multi-planet in scope, tbh.

THON.