The Arcane Box which Lucky recovered in Wave Echo Cave.
He carried it through to Neverwinter, eventually learning from Wizards of the Order of the Many-Starred Cloak (Museum Heist 2) that it took an arcane ember, unicorn horn and clipping from a carnivorous plant under a night sky to power the ritual to unlock it’s powerful magic.
They were able to unlock it post Heist pre-Battle at the Bridge to find a small travelling case revealed the faint outline of a Lephrechaun along with a scroll with some arcane symbols that the wizards weren’t clear about.
