Not all monsters have the intelligence to craft intricate dungeons. Not even all of them have opposable thumbs! This dynamically lit, and I use the term sparingly, dark and dingy holes are the perfect lairs for dangerous beasts to dwell.
Lets just hope your adventurers brought a torch or a light spell with them!
Type: Map Addon
Features: Dynamic Lighting
License: Roll20 End User License Agreement
(Personal Use Only, Do Not Distribute)