Vanquish the Raven God

Hello everyone !

I was doing the quest to be able to summon Anzu, in Setthek Halls Heroic, but when I took the quest, the NPC gave me a bag containing a letter and the item to summon the boss.
I can take the letter out of the bag, but the moonstone remains in the bag, though, and a message appears in red on the screen :
"You can't carry any more of those items"
... But I have no other moonstone in my inventory...
I dropped the item, abandonned the quest, took it back but same story... I checked my character sheet to see if it was an item I could have equipped, but it doesn't seem so... I never did that quest, so I could miss something.
Any idea ?

Thank you !

Maybe it's in your bank?

Thanks for the answer, but it's a negative :( nothing in my bank neither...
Any other idea ? :)

Check your Keyring bag, Moonstone-infused-something should be there

You sir are the MVP... And I'm the dumbest... Thank you :)