Stevonnie: Alexandrite Warrior

After Garnet's wedding, Hessonite invades Beach City instead of the Diamonds. Such an unexpected change of events causes Stevonnie to become a permafusion while the rest of the CGs are trapped in their own gems. To make matters worse, a new gem/organic hybrid arrives to conquer all gemkind. Stevonnie is forced to take up arms. [AU that ties into Kings of Mewni and Owl Haven]