Isle of lendore
Supernal Clarity is a weapon of legacy, it is what it is and it’s one of a kind.
It draws strongly from the diamond mind school
DM: "Right now for example in the hands of a 7th level character it is a +1 rapier that grants the ability to use saphire nightmare blade 5 times a day and gives the user +1 to hit with all diamond mind maneuvers
Of coure with a level 20 wielder, properly attuned the sword can cast time stop."
Made of mithril by a Githyanki and forged in the heat of a red dragon’s breath.