I'd be content if you could rip his head of, or impale your enemy and lift him from the ground before letting him fall, anything actually you do to kill someone with a lightning claw is pure... peotry.
While sounding awesome the whole process might be too long for the few seconds each execution will need to last (for balance reasons all executions will probably have to be of the same duration). Perhaps just a fast thrust into the chest to pull it out and then take a nibble?
So true! The possibilities are nearly endless! I assume so. I'm not too familiar with how an Chaos marine eats but I'm pretty sure they can stuff down a heart quicker then the average human, but then again eating an ork sized heart or a heart of another space marine would take longer...
Plus I would get the idea that they would clash with each other. Two daemons from two different gods.
When you think about it they have powers functioning against each other: Khornes hate vs Slaanesh' Love Nurgles Decay vs Tzeentches Evoloution Khornes Aggression vs Nurgles Apathy Slaanesh' Intoxication vs Tzeentches Discipline (No one ever said Chaos precluded discipline) Khornes Physicality vs Tzeentches Mentality Slaanesh' Vantiy vs Nurgles...Slobbishness? Ultimately the Daemons powers would work against each other weakening and destroyign the weapons power and integrity...not to mention improve the chances the axe will vapourise you in your armour and devour any scraps left.
Thats why i said ambitious. He would first need to pay for some expensive and years long therapy for each demon so they can work over their differences, then follow it up by shoving them all in a cramped weapon (remember even a single Greater Daemon is a furious force to control bound inside a weapon, let alone 4 in a claustrophobic piece of metal). No reason he shouldnt try though, it would make for a fun show.