Background Description from the PDF:
The Font of Sorrows is an ancient abandoned temple complex dedicated to the worship of Water as a Primal Element. It houses the mummies of its highest priests and the enslaved enemies of the cult, drowned and brought to life, forced to guard the temple for eternity.
Recently, a Bulette (Landshark), covered in silvery runes, has made its lair nearby and hunts for food in the surrounding caves. It fought some of the guardians of the Font a few times and prevailed so far.