I have some feedback about the mechanics:
- You are missing a level triggered action
- It's a fun idea to use stability to resist a potency, but I think slowed is way to strong to give just like that: most monsters won't have more than 1 stability in E1, and any melee focused monster will be turned off by that condition
- Seize the Moment is good I think, but I fear teleporting an enemy with you will open up to so many shenanigans (teleporting straight into the air to drop the enemy for example)
- Grasp the Echoes is pretty cool!
- Back With A Vengeance's first sentence is a bit weird: "An alternate future you appears in an unoccupied square within distance"
- On the same ability, it feels like it is doing way too many things. Saving you from death is already pretty good, even more so given that you will gain a Victory at the end of combat most likely (or you'll just be dead anyway)
- Knocked Into Next Week is very flavorful and fun
I think the abilities and the class overall is very flavorful, but I don't really associate that flavor with fury. It feels very Null, but I see why you would do it on a Fury as Nulls already have Chronokinetic.