Sanitarium (5E)

From publisher blurb: The road to Hell is paved with good intentions. The Guild of Peace and Healing have seemingly formed an alliance with the Seekers of Asmodeus, possibly the most unlikely of ties even in these dark times. Is this a union of mutual benefit, or something more sinister? As the creeping madness continues to claw its way across Anduria, infecting the populous and releasing unfathomable horrors, the heroes must uncover the secret of this alliance to save a friend. What they find will rock the city to its very foundations.