NPC Eve Natalia in NW corner of Eden Group 1st floor main room exchanges items for Safe to 7 Certs.
One of the items she claims to exchange in the "What gear?" option is Robe of Cast for 1 random Safe to 7 Cert, but the exchange dialogue doesn't include an option for Robe of Cast. It's also unclear whether she wants Robe of Cast [0] or Robe of Cast [1].