Who's the Hunter, Who's the Game

From publisher blurb:

5th Edition Mini-Dungeon for four to six characters of levels 7-9

The jungle erased the Kingdom of Kazarana from this valley a millennia ago, leaving little of its glory. Now, only strange rune-covered pillars, fractured pieces of road jutting from the ground and the Temple of Jaku remain.

In recent years, these ruins have become a strange place of worship for a tribe of leshy. Although traditionally isolationists, the ruins here represent their hope that one day civilization will be vanquished by nature. Anyone bearing metal through their sacred forest is led to the temple and their inevitable demise.