You can use killer wails for almost anything, For rain maker, I use it to blow up the rainmaker shield, for tower control, I use it to reflect people using blubber or krackens on the tower, and also I use killer wails when someone is going to super jump in a certain area, so yeah, the weapons, I use the kelp splatterscope, splat roller, and Tempered dynamo roller, and custom blaster with the killer wail, and: sloshers have killer wails, splatlings, and ink-brushes do not have this special.