Theory abut the dragon butts in lost izalith

Disclaimer that this is all my speculation and none of this is confirmed officially.

Alright so there doesn't seem to be any explaination about it in game but here's what i think, the dragons in lost izalith are actually immortal like seathe and they were destroyed by gwyn byt he couldn't find a way to kill them so he threw all that was left of the dragons in the lost izalith.

They are also called the bounding dragon and that may be because they bound all the creatures like chaos eaters and bed of chaos in the izalith

The dragons can actually be killed by the player apparently and that may be because they were immortal back THEN and not now(their source of immortality like the ice crystal seathe had must have been broken by something)