Icy Burial (3.5e Maneuver)

You strike with the cold fury of a glacial blizzard, burying your enemy under your blows

As part of this maneuver, make a melee attack. If it hits, in addition to dealing damage, the target loses any damage reduction it has for one round and must make a fortitude save (DC 16 + your Constitution modifier) or be immobilized (all speeds reduced to 0 and unable to take 5' steps) for one round and have its armor and natural armor bonuses to AC reduced by a total of 6, to a minimum of zero each (initiator's choice how this is distributed, subject to the limits of what the bonuses actually are)