Remake Chaos Rider

Hi guys, I was thinking and I decided to remake on of my heroes, the Chaos Rider. Why? Well, this hero has no strategy defined, and with the new patch, he will lose spells. It is just another opportunity to fix a mistake.
So, I was thinking, this hero needs to be a tank hero.

I have some ideas for abilites, but I would like some opinions:
- Dark Nova: Does something that damages enemies and heals him .. dunno what yet, looking for ideas
- Dark Lightning: already done
- Auras of darkness: mainly the hero can choose the aura he has. It is an immolation like ability. The hero can choose between a defensive aura or an offensive one ... but I still need ideas...
- Death Persistence: channel, all units near the hero can take damage, but they will never die as long as they are affected by the spell.This will be a combo for Chaotic Rage, which will give a bonus depending on life.

So, what do you guys think?

When it came to those Orc Raiders/Riders, I always thought of them as rush units. I can't remember if they were any faster, but I've seen people use them chase down archers/riflemen.

Or is this hero not a wolf rider?

This hero is not a Wolf Rider..
It is the Chaos Warchief with some type of small horse.
I plan him to be a tank because I already has mounted heroes with speed bonus spells and such.