I love Abel in nerdy magician mode. If it's magic, he can talk about it forever, and it looks like the elf dude feels the same.
Correct me if I'm wrong, but I think Abelheid was joining in on their little mad scientist's gleeful reconstruction of life.
Since it said "king", I'm just going to assume that's some sort of sky demon king. Y'know, the elves really should've left some notes or something around to warn people not to undo the seal.
Now Abel's gotta kill a high-level monster and who knows what sort of collateral damage it's going to do to these historically valuable ruins?