It's a MOBA, which is kind of like the love child of Overwatch and League of Legends.
You get heroes, you fight in a big map, you have a huge guardian you have to protect, who fights the other teams guardian. And if you kill their Guardian you win! (Only it's not that easy.)
Plus, the art style is amazing, I love it so much.
Go ahead and give it a look! I'm downloading it now.