A character possessing 4 or fewer ranks in Athletics suffers a –4 penalty with all attack checks, Reflex saves, and skill checks made underwater (except Athletics/Swim checks). A character possessing 5 or more ranks in Athletics suffers a –2 penalty with these checks.
Without special gear or abilities, an underwater character may make only unarmed, melee, and explosive attack checks. Unarmed attack checks suffer no penalties, but the error ranges of all melee attack checks are increased by 2. Further, the damage of any melee weapon to which the wielder’s Strength modifier is applied is reduced to 1/2 standard (rounded up). Finally, the blast increment of any explosive set off underwater is doubled, but the error range of any attack check made to set an explosive increases by 2.
A character who remains underwater for more than 1 hour and dives below 100 ft. must surface slowly, a process that requires 30 minutes per 50 ft. he submerged. Otherwise, he becomes stunnedA stunned character is vulnerable, may take no actions, and may not hold any objects in his hands. and suffers 1d6 lethal damage per round until he’s placed in a pressure tank and decompressed over the same time period.
A character who remains underwater for more than 1 hour and dives below 50 ft. suffers a –4 penalty with all Intelligence- and Wisdom-based skill checks. This effect lasts for 30 minutes per 50 ft. he submerged.
A character who submerges 100 ft. or more must make a Fortitude save once per minute or suffer 1d6 subdual damage + 1d6 additional subdual damage per 50 ft. submerged. This save’s DC is equal to 15 + 1 per previous save until the character rises past 60 ft.
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