Ghost Saber is tameable. Just keep your "trash" pet handy cause those mobs around the ruins are a pain. Put pet on passive right before you open a cat figurine, and if Ghost Saber spawns abandon the "trash" pet and start taming. He does retain the ghosty form after taming. Real cool!!

If you have to run away and heal up he does not dissappear. I had time to bandage up and retry the tame. Got him the 2nd try.

By the way it took 24 figurines for him to spawn for me.