Zezenia is NOT just a server. It's also the CLIENT.
It's a completely separate game that has very little in common with Tibia and OpenTibia. It doesn't use OpenTibia for server, and is not just an edited Tibia client.
It's a game developed completely from scratch, and just because it has graphics similar to Tibia (which actually lifted the perspective off of Ultima), and just because it's a bit inspired by Tibia, it doesn't mean it's Tibia.
Go K-Zodron.