Much like the one that preceded it, season 2 of Invasion mode boasts plenty of great skins for Mortal Kombat 1 players to unlock. Some of these come as rewards for defeating certain enemies, while others can be found inside chests. When it comes to the latter, players will usually need to get their hands on an ornate key in order to get inside or solve a Klue to clear the debris that's blocking their route to the chest.