Her lusus is never revealed but it was probably some sort of high blood sea creature like the ones seen here.

Feferi uses an ipad instead of a computer for trollian. 

Their main bodies were killed by Bec Noir.

The game begins when two players make the client-server connection. The server deploys the cruxtruder, the pre-punched card, the totem lathe, and the alchemiter in the house of the client. The cruxtruder lid must be hit with a heavy object and it will open, releasing the kernel sprite and cruxite dowels. Insert the pre-punched card into the totem lathe then place a cruxite dowel in its carving mechanism. The dowel will be carved in a specific pattern and athen you take the dowel to the alchemiter machine. It will scan the dowel and alchemize an object and you use it in a specific way. If you use your artifact correctly before the meteor destroys your home, you and your house will be teleported immediately into the Medium and you’ll find yourself on your planet. 

No, Meenah had a different lusus. Gl’bgolyb was only sent to Alternia after the scratch. 

They would’ve ceased to exist but they escape their session. Jade and John went through a fenestrated panel and Dave and Rose rode in Derse’s moon to the Furthest Ring, the area in-between sessions.

It means making the volcano “Forge” active again. 

Yes, Eridan mentions it here.

No, sorry.

This guy, the Genesis Frog.