I have some friends who decided to fight Gladiator in Mount Olympus early around level 60 in order to get the Alpha and Omega ring, however they claimed that after they obtained the ring, it was deleted from their backpack. Do you have to be a specific level to keep the Alpha and Omega ring?
No. There are only a few possibilities. Their backback was full so it went to their bank, they sold/deleted it, they never won it or both bank and pack were full which means you get no drops at all. I would go with they are just messing with you and never got it.