From the Whispering Blade Chapterhouse Access Quest, introduced during the Shining Runes and Shadowed Hands event.

Ring of the Summoning Adepts
Value: 0
50 Burden Units
This ring belonged to a Summoning Adept in the service of Count Dardante. It served to grant them access to Dardante's Summoning Chamber.


Special Properties: Attuned, Bonded

Notes

You give Harkwull the Discreet Ring of the Summoning Adepts.
Harkwull the Discreet tells you, "Right, well, this won't be much use to you any more. Thank you again for your assistance."
You've earned 2,756,000 experience.