Watersense

• Range: varies (typically 5 to 120 feet)
• Requires Line of Sight? No
• Requires Line of Effect? Yes
• Usable for Combat Targeting? Yes
• Bonus/Penalty vs. Stealth? Perception check with a +5 circumstance bonus
• Ignores Invisibility? Yes

Description: Watersense functions almost exactly like Tremorsense, except that it detects movement and displacement within water, rather than vibrations through the ground. For the purposes of this sense, any liquid is considered "water", although many exotic liquids have hazards associated with them. As a result, watersense does not function out of water too shallow to allow a Swim move, or in any other environment which lacks liquids.

Any non-stealthed creature moving through water which is shared by the creature with watersense, and that is within range, is detected. The creature with watersense must make a perception check to detect stealthed creatures within range, but gains a +5 circumstance bonus to its perception. The DC of the perception check is equal to the stealthing creature's stealth check result. Invisibility does not provide any benefits to stealth against creatures with watersense. Detected creatures do not have concealment.

Watersense does not require line of sight, but must trace line of effect through the same body of water (or other fluid medium) as the creature with the sense. Spells such as Fog Cloud (Sorcerer/Wizard Spell), Wind Wall (Sorcerer/Wizard Spell), or Pillar of Fire (Sorcerer/Wizard Spell) are defeated in a fluid environment, and permeable walls or pillars, like Pillar of Thorns (Druid Spell) do not impede watersense in any way. Pillars or walls of stone, force, or any other non-fluid element, particularly if they block line of effect, block watersense.

Watersense will allow the detecting creature to distinguish between friend or foe, and it easily provides enough detail to allow the detecting creature to attempt a lore check against an unfamiliar creature, or recognize previously encountered individuals. Watersense is highly precise, and even will allow reading of script and other such detailed things, assuming the water does not dissolve the parchment or ink, etc. Carvings or durable painted words in water are easily read by watersense.