This is a list of enemies that drop Tier 5 Rings.
Sort order is alphabetical, ignoring descriptors where it would separate otherwise similar enemies, and ignoring articles.
The enemies are:
Avalon the Archivist
Corruption Phantom
Beer God
Cube God
Daichi the Fallen
Old Chest
Factory Control Core
Ghost of Skuld
Golden Oryx Effigy
Heroic Archdemon Malphas
Heroic Septavius the Ghost God
Horrific Creation
Janus the Doorwarden
Jon Bilgewater the Pirate King
Kogbold Expedition Engine
Lord of the Lost Lands
Murderous Megamoth
Nightmare Colony
Oryx the Mad God
Oryx the Mad God 2
Pentaract
Skull Shrine
Son of Arachna
Royal Cnidarian
Shaitan the Advisor
The Puppet Master (Encore)
Xolotl the Lightning God
El Dorado
Standard Quest Chest
Mighty Quest Chest
Cultish Epic Quest Chest
Crystallized Epic Quest Chest
Honeyed Epic Quest Chest
Marble Epic Quest Chest
Royal Epic Quest Chest
Voided Epic Quest Chest