Hot springs in the forest at the base of a mountain have become a bit of a tourist trap for those who would come and try get the healing powers of the Hot Springs. Above the Hot Springs stands a tall tower which has a fire burning all day and night, and a large brass onion-dome gleaming in the light. The locals call it The Lamp. Nobody goes into the Lamp, and nobody leaves the Lamp.
This is a short module for a party of Level 11+ characters and includes:
About 9h of gameplay (3x 3h sessions or maybe more)
A full set of maps
Relevant OGL Monster stat blocks for 3.5E and 5E systems
A couple of sets of puzzles you could also take and use in other games including one that will challenge most players.