# Set the height limit to X blocks above the ground for flyers, 0 = Infinite [0-100]
I:"flying height limit"=0

When set to this option, their flying height is not infinite - it is 0. The mob cannot ascend at all and flies "0" blocks above the ground - vespas constantly bump down so they hit the ground, ghost rays skate along the ground very slowly, and so on. If pushed off a ledge, they can only descend, never ascend, because their code is telling them they can't be more than 0 blocks off the ground.