From publisher blurb:
Forgotten Encounters: Underground is a spin-off product from our popular Encounter Pages and Tricky Owlbear Publishing's Forgotten Foes.
Within this issue of Forgotten Encounters you will find five easy to use encounters featuring creatures from Forgotten Foes that live underground.
This issue features:
Each release has full stats for the monsters involved, additional rules for feats, magic items and spells as well as a set of counters for use at your table.