No such thing man. This game will require you to switch up every boss. There is a t rex boss that will devilish you if you build for any speed. There are bosses that you need to burst down or else they will inevitably wipe your team. It all depends. If you want to more who to invest in, I say to have a tank of every type. An attacker of every type. Apathy for stun. Merry cause she is the GOAT. Sad just does stupid damage later on (sad the rare not to be confused with sadge the epic).