Requiem Fiend

Effect

 * If you are not already Dazed, then it does its Melee attack which may Daze you* (3 rounds, 33% chance of not acting), subject to a save**.
 * Otherwise, it does its Ranged attack. This attack can make you Diseased*** (-25 END; 75% effectiveness) for four rounds, subject to a save****. Or, if you are already diseased, then it deals increased damage†.

* - You see miniature skeletal vultures flying around your head or at least you think you do! ** - You endure the stunning blow! *** - You have been infected with Grave Rot! **** - You resist being infected with Grave Rot! † - The corruption of the disease empowers Requiem Fiend!

Also see
Corpse Fiend, Grave Fiend, Charnel Fiend, Crypt Fiend, Catacomb Fiend, Necropolis Fiend, Golgotha Fiend