I'm not sure if I should put one of the Dames into this piece for scale Tho it does show up again later in "The Pit" scene.
The tendrils surrounding it are mainly plant based, the fluid oozing out of it are... troubling.
I'd theorized that its occupant likely has become corrupted by a some sort of lovecraftian entity and thus sealed away to prevent its corrupted blood from spreading.
Though that would make me question if it has any possibility of infecting the party. Maybe light exposure is okay given how dormant its been. XD
Its form represents the nature of its contents.