SRD:Swim Skill

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Swim (Str; Armor Check Penalty)

Check

Make a Swim check once per round while you are in the water. Success means you may swim at up to one-half your speed (as a full-round action) or at one-quarter your speed (as a move action). If you fail by 4 or less, you make no progress through the water. If you fail by 5 or more, you go underwater.

If you are underwater, either because you failed a Swim check or because you are swimming underwater intentionally, you must hold your breath. You can hold your breath for a number of rounds equal to your Constitution score, but only if you do nothing other than take move actions or free actions. If you take a standard action or a full-round action (such as making an attack), the remainder of the duration for which you can hold your breath is reduced by 1 round. (Effectively, a character in combat can hold his or her breath only half as long as normal.) After that period of time, you must make a DC 10 Constitution check every round to continue holding your breath. Each round, the DC for that check increases by 1. If you fail the Constitution check, you begin to drown.

The DC for the Swim check depends on the water, as given on the table below.

Water	Swim DC
Calm water	10
Rough water	15
Stormy water	201
You can’t take 10 on a Swim check in stormy water, even if you aren’t otherwise being threatened or distracted.

Each hour that you swim, you must make a DC 20 Swim check or take 1d6 points of nonlethal damage from fatigue.

Epic Check

You can swim up vertical surfaces, or swim much faster than normal.

DC	Task
80	Swim up waterfall

Swim up Waterfall

This use of the skill allows you to swim an angled or vertical surface, as long as you remain completely or mostly immersed in water. Other examples might include swimming up a whirlpool or an incredibly large wave.

Circumstance	DC Modifier
Speed swimming	–20

Speed Swimming

By taking a –20 penalty on the check, you can swim your speed as a move-equivalent action, or double your speed as a full-round action.

Action

A successful Swim check allows you to swim one-quarter of your speed as a move action or one-half your speed as a full-round action.

Special

Swim checks are subject to double the normal armor check penalty and encumbrance penalty.

If you have the Athletic feat, you get a +2 bonus on Swim checks.

If you have the Endurance feat, you get a +4 bonus on Swim checks made to avoid taking nonlethal damage from fatigue.

A creature with a swim speed can move through water at its indicated speed without making Swim checks. It gains a +8 racial bonus on any Swim check to perform a special action or avoid a hazard. The creature always can choose to take 10 on a Swim check, even if distracted or endangered when swimming. Such a creature can use the run action while swimming, provided that it swims in a straight line.

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