Loki has taken the throne after the events of Thor: The Dark World, but his reign is in need of some stability. He's decided that Erna, a light elf visiting from Alfheim, might suit his needs nicely. symbiosis noun sym·bi·o·sis \ˌsim-bē-ˈō-səs, -ˌbī-\ biology : the relationship between two different kinds of living things that live together and depend on each other