From publisher blurb:
This book contains an adventure from the Djorde setting, built for the 5e, PF2e, and STRONG RPG systems and suitable for four level 4 characters.
Underneath the waves of the Scythe Sea lie the ruins of an ancient civilization. Known as the Serra, these water-breathing folk once dominated southern Djorde many millennia ago, until they were bound into slavery by the Old Atlas Empire. Desperate for a chance at freedom, the Serrans called upon eldritch powers from beyond the circle of the world. The aberrants who answered them granted their desires but at great cost. The underwater ruins the Serrans left behind still bear the scars of that bargain, and perhaps even the means to enact it again.
In this adventure, the PCs will journey to a rune-covered temple at the bottom of the ocean, perhaps motivated by fame, fortune, or forgotten magical secrets. However, the dangers found underneath the ocean are never as they might seem at first glance. Eldritch horrors lurk in the shadows, the remnants of an ancient bargain. Only the most courageous of adventurers could hope to return to the surface alive, though it is likely they will never be the same again.