Bring shooters, start shooting rats in his backfield. Anytime i hear outcasts, i bring shooters. Bring friekorp trappers, if you have too. Its 14 pts. If you don't have that, push your regular shooters forward make them the target the rats. Spread out, so if you can't kill the rats, Killjoy and the Viks don't punish you to badly.The majority of their list is the killjoy bomb. Make them pay for it. Take Aionus and kill Killjoy before he gets unburied. If not just kill the rats. If killjoy isn't close enough to charge you, he has to charge his own crew. It's a one trick pony. Play some "friendly" games against it