For group 1 i'm pretty happy at least these have some use

If i could add anything it would be Souleater's effect +1% a merit (2handed weapons only).

For Group 2 there is alot of improvement that can be made here.

Muted soul is now near useless
Increasing the enmity - to -75 or -80 would make it useful agian or just make it so it stacks w/ gear (additivly)

Dark seal

While the idea is nice it doesn't add that much
Making it so that Absorbs would last longer(5-10mins) and not decay would push this back up imo
Adding a potency boost to it would be nice but i guess it would be stepping on N.Voids shoes then,

Diabolic eye
-15%hp for +20 acc is a joke
Either remove the -15% hp
Or add a +DMG% boost to make this worth it.

Desperate blows

Is awesome but if ya want you could make it let DRK hit 85-90% haste (i know OP but i miss the 93% haste days lol)