Cronus claims that Lord English tried to kill him with a spell once but the spell deflected and split his soul into several vessels until he could find another way to enter their universe. The entire event is an obvious Harry Potter reference. 

Doc Scratch tied her life directly with the Genesis Frog’s life but the details of how he did this aren’t revealed. 

Eventually, yes a new session will be started by a new set of players.  

Pre-session doomed timelines can happen. There was a doomed timeline where Karkat didn’t run the Double Mobius Reacharound virus and also Gamzee flipped out before everyone entered the game and he killed all 11 trolls. 

I want to say no but I’m not sure.

A Void session means that the players don’t prototype anything pre-entry and their Battlefield never evolves and grows. Jade has the Beta kids’ fully prototyped Battlefield so they just need to place it at the center of Skaia. 

Their Quest Beds and Sacrificial Slabs have both been destroyed.

He got the ring when he cut it off the Black Queen’s finger with one of the weapons in the green box that contained all the Beta kid’s weapons. 

She died and Bec Noir placed her corpse on her Quest Bed and Jadesprite (who was her dreamself) went godtier.

Karkat created 24 trolls in total. His group were the ancestors in the pre-scratch universe on Beforus and Meenah and the others were the players. Meenah’s session scratched and the troll groups were switched. Meenah’s group became the ancestors post-scratch on Alternia and Karkat’s group became the players.