Killing Fog Veil (Stronghold Augmentation)

Fog Veil, Killing: When creating this augmentation, choose one face of the wall. A 10-foot-thick cloud of mist extends out from this side of the wall. The fog obscures all sight, including darkvision, beyond 5 feet. A creature within 5 feet gets one-half concealment (20% miss chance for attacks). Creatures farther away have full concealment (50% miss chance, and sight can’t be used to locate the target).
This fog is sickly green and poisonous. Any living creature in the killing fog veil with 3 or less HD dies instantly (no save). Creatures of 4–6 HD must make Fortitude saves (DC 17) or die. Those that survive (including all creatures above 6 HD) take 1d10 points of poison damage each round, whether they breathe or not.
The fog veil disperses in a moderate wind (11+ mph) in 4 rounds. A strong wind (21+ mph) has the same effect in a single round. Once the winds die down, however, the fog returns within 1d4 rounds.
Caster Level: 9th; Prerequisites: Craft Wondrous Item, cloudkill; Market Price: 22,500 gp.

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