In Burgha's Sanctum

From publisher blurb:

A 5th Edition Mini-Dungeon for four characters of level 4

The adventurers arrive at the Sanctum of Lady Burgha, patron saint of retired adventurers, to make use of its celebrated resurrection pool. However, a week ago, an aridni named Finch Brushwood took over the sanctum with a troop of extraplanar fey creatures, slaying the usual caretakers. Most of the fey regard the “invasion” as a humorous lark, but Finch slowly leeches the power of the resurrection pool into a gem to present to the Fey Queen.