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Assume mastery to the level that they were achieved IU:

Orbalisk armor
Star Forge
Malachor
Vjun
Nathema ritual
Kun's amulets
Satele Shan's battle meditation
Luke Skywalker's battle meditation (LotF: Invincible)
Dathomir amp for Talzin
Vaapad Windu
Zonakin

Not manually restraining your power anymore isn't an amp.

Originally posted by DarthAnt66
Not manually restraining your power anymore isn't an amp.

Arguably but I wasn't being too pedantic with "amp" there.

I'm not sure if Anakin can just turn on his "zone" state at will so long as he isn't holding back anyway, but I guess that's another topic of conversation.

Yes, he can. It's not a matter of "being in the zone," it's a matter of being willing to cross his self-imposed boundaries.

Yeah, he was perpetually in the zone as Knightfall Vader.

He was even stronger than on the Invisible Hand by that point.