Aquatic Affinity

General Feat (Prerequisite: Level 4+, Constitution 13 or higher)

You possess attributes common to sea creatures. The ocean loves you, and you move through water as naturally as a fish. As you grow in power, your affinity deepens.

Ability Score Increase. Increase your Constitution score by 1, to a maximum of 20.

Deep‑Sea Adaptation. You gain the following benefits while underwater:

• Swim Speed.You have a swim speed equal to your walking speed.
• Underwater Agility.You do not suffer disadvantage on melee attack rolls or Dexterity checks while underwater. You can act and move freely underwater for up to 1 hour (no equipment needed). After that, you must hold your breath normally (as per the standard rules, which allow 1 + Constitution modifier minutes).
• Dive Depth.You can dive up to 15 meters (50 feet) without any protection or equipment, taking no pressure‑related harm. At level 9, this increases to 30 meters (100 feet). At level 14, to 60 meters (200 feet). At level 19, to 100 meters (330 feet).
• Natural Buoyancy.You can float on the water’s surface without sinking, even when unconscious or asleep. You can also choose to sink or rise at a rate of 30 feet per round.
• Enhanced at Sea.While you are in a sea, ocean, or similarly large saltwater body, you gain a +1 bonus to attack rolls, ability checks, and saving throws. This bonus increases to +2 at level 11 and +3 at level 17.

High‑Level Improvements (Level 9+). Starting at level 9, your aquatic affinity deepens further:

• Extended Underwater Activity.You can act and move freely underwater for up to 4 hours before needing to hold your breath. At level 15, this becomes unlimited (you no longer need to hold your breath – you extract oxygen directly from the water).
• Speak with Aquatic Animals.You can understand and communicate simple concepts with beasts that have a swim speed (e.g., fish, dolphins, crabs). This works like the speak with animals spell but only for aquatic creatures, and it is always active while you are underwater.
• You gain Darkvision with a range of 60 feet. If you already have Darkvision, its range increases by 30 feet.
• Underwater Vision.You ignore any penalties caused by dim light or darkness while underwater. In the dark deep sea, you can see clearly as if in bright light (this is supernatural and not reliant on light sources).

Pressure Resistance. You are immune to the effects of deep‑sea pressure (no need for special equipment to survive at any depth you can reach). This does not protect against cold or other hazards.