Magic:Acid Fog

Conjuration (Creation) [ Acid ]
Level: Sor/Wiz 6, Water 7
Innate Level: 6
Component(s): V, S
Casting Time: 1 Action
Range: Long
Target: Area: Large
Duration: 1 Round/2 Levels
Counter(s): --
Saving Throw: Fortitude
Spell Resistance: Yes
Metamagic: Empower, Extend, Maximize, Quicken, Silent, Still
Energy Substitution: No

A bank of fog billows out from the point the character designates. Creatures inside the cloud must make a Fortitude save or have their movement reduced by 50%. Creatures entering the cloud take 4d6 acid damage. Every round a creature spends in the cloud, it suffers an additional 4d6 points of acid damage.

Note - Area of effect (AoE) damaging metamagic (Empower and Maximize) can only be done with the proper feats and not with metamagic wands (yet).