Some icicle mechanics

Since icicles are not as sturdy as dripstones, I suggest they deal a bit less damage when falling on a player or vice versa, but to compensate they should also give them freezing effect or slowness. Also they should break once the players and/or large mobs step on them.

One more small but cool idea: icicles, and maybe pointed dripstones and sulphur spikes too, should be able to be used as single-use melee weapons. It doesn't have to deal much damage, but would be a neat thing, especially once the main weapon breaks in caves while fighting mobs.