Casket with valuable items. Contains Spheres of Resistance and Stances. Additionally, inside you may find Scroll of Dissipation, elements of a Healer Collection, quality of which is one step higher than the quality of the Collections you've already completed, and a Healer's Kit, quality of which is one step higher than the quality of the Kit already available to you (based on your Hero of the Empire Reputation).
Can be acquired by healing other players from Curses. The more powerful the Curse, the bigger the chance to receive the Casket.