Vengeance shenanigans

I find it interesting that Nemesis LTs are able to self cast Vengeance on themselves when they are killed. Are there any other mobs that can pull this off with Vengeance itself or other powers?

They're using the original version of Vengeance, where you had to die for it to activate.

I have the +perception IO in rage on my brute because I hate being blinded. Now I can continue pounding them even when they use smoke on me.

Psi attacks are still defended against by NPC MoG's +Defense. Taunt would, indeed, be a fine way to poke them with a Psi damage proc, but actual Psi attacks whiff as much as everything else.

I actually do not remember what original MoG provided - positional or typed. (Note that typed defense has no strict relationship to what types of resistance a power offers - they can be set separately.)

If Mind Control powers land on MoG'd critters easily that certainly suggests they are using positional defense and not typed, in which case only Psi Blast type powers would be defended against because they have a positional attack type. I had plenty of experience not being able to hit MoG-ing Paragon Protectors on my Dark/Psi Defender, so the mos definitely don't have typed defense that just has a Psi hole, unless it's changed relatively recently.

dont forget valkyrie still has the original MoG too

The worst thing about PP MoG is that to do the low health trick, they heal then take a large amount of self damage thus stealing your XP.