Messengers (New Supernatural Entity )

So what should I post next?...Hmm? I know! Meet the Messenger! The messenger will be a supernatural enderman like entity with a bright yellow halo on its head and white skin, and will super rarely spawn in all biomes of the overworld and the END and Nether to watch you. This messenger has a unknown amount of HP and is neutral. If you do find one then be don't scare it or it will teleport out of our dimension. But if you get to it and hurt it then it will start to shoot lightning at you, no matter what dimension your in. And the messenger will remember you, so if you hurt it then it may follow you and soon try again. If your good to it then you can trade with it, but with what? It will trade you some rare items in the game for cheap stuff. But so it's not overpowered, this entity has a spawn rate of 0.000000001 out of 1,0000000000. So ya, don't try to just go looking for it, as you may die before it even wants you to see. But you can spawn it in with a spawn egg.