No Prep Module: Sunken Secrets of the Swamp Dragon (Patreon)

https://www.kassoon.com/dnd/adventure/no-prep-module-sunken-secrets/ 

Glowing shards of an ancient magic unleashed from a swamp dragon's destructive greed threaten to drown a village of lizardfolk.

https://www.kassoon.com/dnd/adventure/no-prep-module-sunken-secrets/