Quote Originally Posted by Nalien View Post
snip
Aether was formally sealed beneath silvertear lake before Midgardsomr and the ship crashed into it, which allowed the resummoning of all the other primals once the seal was broken (hence why you see the primals flying away from everything). However we're unsure why the Garleans were there in the first place since they hate primals/eikons so it doesn't make sense for them to want to unseal the aether.