My idea on a NM
Because anima is a life energy deal(stealing this from an anime) it could make sense that it creates an entity of some sort. Kinda like in Index(have to watch it to know what I mean). So, when x amount of anima has been used through out all of the servers, it will spawn this entity.
Why do I say all the servers? Well, this is a way they could make use of their, dungeon finder deal they are going to do(I don't like by the way). So, what will happen is when it spawns(it can even wonder the world as a ghostly figure that you can't attack, until its a whole body) it will select 20 people from each server whom last teleported(that are level 50) and spawn them in an instance with this entity. Now, it wouldn't have any special drop, it would just be a fun random activity that we the people caused. (something along those lines please discuss this!)