Hmmmm the vestiges have powered up in order so far.
Raven Queen armor was first (Ep 44 get) - (bonus wings)
Mythcarver was second (Ep 49 get) - (epic slashy move)
Titanstone Knuckles (Ep 52 get)
Fenthras (Ep 63 get)
Whisper (Ep 69 get)
Cabal’s Ruin (Ep 69 get, a little after Whisper, because Percy uh. Couldn’t wear it right at the start.)
Spire of Cornflakes Conflux (Ep 71 get)
Plate of the Dawnmartyr (Ep 76 get)
I think they’re probably powering up because Significant Character Things are happening to the players, but also I’m curious to see if they will indeed go in order. Maybe u need to hang out with ur vestige for a bit.