Valhalla Is Nicer Than Olympus (literally)

This is a fanfic where Percy Jackson and the Olympians, The Kane Chronicles, Heroes of Olympus and Magnus Chase comes together, facing doomsday (again)
This time against Gaia, Tartarus, Nyx, Kronos, Apophis, Surt and fenris (the wolf)

I do not own these characters, Rick does but the story line is mine (and probably @cai7lint-xo's she suggested it)

This is my first time writing a fanfic so pls comment if there are any mistakes... Thx fo reading :)