Brys Beddict;164477 said:
Rake's Skykeep was in pretty shoddy condition by time MoI rolled around. Tays nearly destroyed the thing and then Rake went and crashed it into a building. Its no wonder why it broke; it was too damaged to keep working, kinda like an TI that sustains too much damage and gets severed from the ritual. Also, wasn't Rake's Skykeep found inside a glacier? I'm reckoning that would've damaged it too (likewise it could've preserved it
).

It was a mountain though...so it's nothing if not sturdy.
That's part of SE's brilliance. We know next to nothing about Assail and Jacuruku but he tantalizes us so much with little tid bits.