You can find the full Carian Knight Set in Raya Lucaria Academy. Fast travel to the Church of the Cuckoo Site of Grace and head to the graveyard. To the right of the gate's entrance, hug the wall ...

“Greatsword embedded with a blue glintstone. The favored weapon of the steadfast Carian knight, Moonrithyll. Moonrithyll was the Twin Moon Knight's chamberlain. She was also a friend to the ...