No Prep Module: The Rainbow Dragon (Patreon)

https://www.kassoon.com/dnd/adventure/no-prep-module-the-rainbow-dragon/ 

Amidst the suspended corridors of a floating arcane academy, the PCs unravel the sleeping curse of Veridian Rest, confronting a Rainbow Dragon of dreams.

https://www.kassoon.com/dnd/adventure/no-prep-module-the-rainbow-dragon/

This module includes a new monster:

https://www.kassoon.com/dnd/monster-stat-block/2979/adult-dream-dragon/