So I use merciless every time against the crystals in the bathhouse. Mostly because they are so good for the bathers. The thing is, in challenge mode I don't even need to kill bathers because I'm in charge of staying in the pool. So I was thinking what is the best weapon for the crystals? Rockets should do high damage to all three crystals considering they are so close to each other. Grenade launchers sound pretty good as well. Anyone know the best weapon for taking out the crystals?