Okay I looked at the Revenant in more detail and it has a lot of stuff that seems pretty relevant for a revenant which you kinda needed to build around (like with the item that let's you exist longer as a Revenant for example) a lot of stuff will not ever come up (like you're vendetta)
Could I propose the following:
Strangeness undead player race.
Just undead traits,
Strength +2
LA + 1
No worries about needing to live longer, you can still play it with the background and I don't have to worry about Fast Healing, DR and a bunch of immunities.
And I'm aware of Elephant in the room, I don't want it for this game, but that's kinda the reason I gave away 2 bonus feats should you need them.
That is a fun concept.
You can have the weird ability retribution and I would prefer no regeneration or Fast Healing.
I like the goal, though it probably wouldn't play much of a role in the dungeon escape.
Spinning blade fluffed like a whip sword is fine with me.