Temperature (OSS)

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Because the depths of the ocean absorb energy (light and heat), the sea can be a very cold place especially deep underwater. Any surface-dwelling character traveling at depths below 300 feet must possess some magical means of protection against the cold. Unprotected characters receive a -2 penalty to attack and damage rolls, and must add +2 to initiative rolls. These penalties are in addition to the standard underwater combat penalties (listed in the Underwater Combat chapter). Thus, an unprotected surface dweller traveling at a depth of 200 feet would actually have a -6 attack roll penalty, a -2 damage penalty, and would add +6 to initiative rolls.
==Optional Rule: Freezing to Death==
The cold temperatures present at depths below 300 feet can eventually take their toll. Unprotected surface dwellers must attempt a Constitution check with a -2 penalty each hour they remain submerged at a cold depth (below 100 feet). Failure indicates that the character in question loses 1d4 Constitution points as the cold water leeches a good portion of his body heat. A character literally freezes to death once he reaches 0 Constitution points. However, a character can regain Constitution points at a rate of 1 per hour if he rests in a warm area. A restoration spell instantly restores the character to full Constitution points.