Poison an entire dimension of mortal beings.
By so doing, Fel would advance to rank "5" before all of her mates!...
...and the souls of the dead mortal beings will flood the dark realms, making Skotos stronger, unnaturally.
Fel, already intoxicated with the menacingly explosive power of dark poison was tempted. And having lost the bulk of her morals to the depravity corrupting her veins more and more with each passing day, she accepted the Dark Lord's quest.
She did it. Yeah. Fel murdered 36 planets full of living mortal creations with her dark poison.
It was a brutal genocide.
___
The moment the deed was done, Fel felt in her veins, an incredible and intoxicating rush of power.