Solid Fog

This spell functions like obscurement, but in addition it is so thick that any creature trying to move through it is slowed to a speed of 5 feet, irrespective of its normal movement. It also takes a -2 penalty to all attack and damage rolls made in the fog. The solid fog also stops any physical projectiles, making ranged weapon attacks ineffective. The reduction of movement also applies to falling, so any distance that falls through the fog doesn’t count toward falling damage. This fog is more difficult to disperse than obscurement; it takes a severe wind (31+ mph) to disperse it, doing so in 1 round.