Underworld Lairs is a collection of 14 lairs. OGL content includes the names, statistics, descriptions, and abilities of the cave giant shaman, cave-touched dwarf, crawling charnel, and derro guard monsters. It also includes the breaker lance, impact club, and impaling weapon magic items.
OGL Content:
Breaker Lance - (item)
Crawling Charnel - (monster)
Derro Guard - (monster)
Dwarf, Cave-Touched - (monster)
Giant, Cave - Shaman - (monster)
Impact Club - (item)
Impaling Weapon - (item)