Its the corrupted red dragon kept in the nexus, that malygos has taken as his fuck toy.

Keristrasza :D
Alexstrasza is much more... ornate. :)

eradragon has big dopey noodley fingers
his dick is a lot bigger than in other pictures
his body looks misshapen, wings look like they're made of plastic.
kerastrasza has a human vagina on her dragonform

Well, she did say to enjoy your final moments.

Perhaps he took it literally. :3