I would have a problem with trying to eliminate the Underworld. Â It has been in existance for so long, and has developed a whole series of gods and systems to keep it running, that I could argue the fact that it may stay in existance even if you remove the connection of the 'dead' Primordials, or if you find a way to fully destroy them by sending them into Oblivion.
Of course, the Deathlords may have a problem with that plan. Â Since the Primordails were the one to turn their Solar shards to serve Oblivion, they may lose their power, or be destroyed outright if the Primordial they 'serve' is reanimated or destroyed. Â That could make for one hell of a war in the underworld; 'lets destroy this Primordial, so that it eliminates the First and Forsaken Lion without ever having to fight him directly.' Â Or, 'we must join forces to stop this threat from taking all of us down.' Â If all the Deathlords stopped fighting one another and linked up, they could take down much of Creation without breaking a sweat. Â Add to that the independant gods and beings that depend on the Underworld to 'exist' and ouch. Â That fight would make the Fae invasion after the Great Contagion look like a border skirmish.
Of course, the Deathlords may have a problem with that plan. Â Since the Primordails were the one to turn their Solar shards to serve Oblivion, they may lose their power, or be destroyed outright if the Primordial they 'serve' is reanimated or destroyed. Â That could make for one hell of a war in the underworld; 'lets destroy this Primordial, so that it eliminates the First and Forsaken Lion without ever having to fight him directly.' Â Or, 'we must join forces to stop this threat from taking all of us down.' Â If all the Deathlords stopped fighting one another and linked up, they could take down much of Creation without breaking a sweat. Â Add to that the independant gods and beings that depend on the Underworld to 'exist' and ouch. Â That fight would make the Fae invasion after the Great Contagion look like a border skirmish.