It causes a lingering effect of Aether's Breath. The Aether Dragon is vicious monster which shoots wind balls at its enemies. They are the servants of the Aether Dragon who will fly over the area and protect its interests.
The Aethermen are tall, slender people who bear a golden crown on their head. (Make sure to drink a potion of night vision!) Make sure to bring night vision potions, weapons, armor and maybe a poison dart shooter (bow and arrows) as everything you will find there will be hostile. ( Follow this guide to learn how to build one.) To build the portal you will need 12 Aether Portal blocks and 12 Aether Portal Keys. (And since it replaces the End you can also just find a stronghold which contains a portal room if you find that easier). The Aether is another dimension and to get there you need to build an Aether Portal. Updated: 4 February, 2018 ( read changelog) Give it a try if if you want to experience something new in Minecraft!
They are extremely dangerous and should be approached with extreme caution. Here you will find Aethermen and the Aether Dragon who actually look like divine and sacred creatures, but don't be fooled. This add-on replaces the End with a new and exciting dimension known as the Aether.