Solid Fog Spell
D&D Description of the Solid Fog Spell : This spell functions like fog cloud, but in addition to obscuring sight, the Solid fog is so thick that any creature attempting to move through it progresses at a speed of 5 feet, regardless of its normal speed, and it takes a -2 penalty on all melee attack and melee damage rolls. The vapors prevent effective ranged weapon attacks (except for magic rays and the like). A creature or object that falls into Solid fog is slowed, so that each 10 feet of vapor that it passes through reduces falling damage by 1d6. A creature can't take a 5-foot step while in solid fog.
Deeper info on this Dungeons & Dragons Solid Fog Spell
Note: Add a Reply about how you have applied the use of the Solid Fog spell in a previous Dungeons & Dragons scenario.