No Prep Module: Ascent to Lavendros' Lair (Patreon)

https://www.kassoon.com/dnd/adventure/no-prep-module-ascent-to-lavendros-lair/ 

With reality unraveling around them, the heroes race against the clock to find the dragon's lair adrift in the Astral Plane and stop his apocalyptic ritual from shattering the delicate strands of the multiverse.

https://www.kassoon.com/dnd/adventure/no-prep-module-ascent-to-lavendros-lair/