Water Domain

• Level 2: You gain Water Breathing.
• You gain +1 to Swimming and +2 Cold Spell Power (Glaciation) per Cleric level.
• Your cold spells will use Positive Spell Power if it is higher. Your healing spells will use Cold Spell Power if it is higher.*
• Your Turn Undead works on Elementals.^†
• Upon Turning: When you use Turn Undead your party gains a bonus to Will saving throws equal to half you Cleric level, and points of Cold Resistance equal to twice your Cleric level for 20 seconds.
• Level 5: You gain Solid Fog as an SLA. 10 SP, 12 second cooldown.
• Level 9: You gain Cone of Cold as an SLA. 10 SP, 8 second cooldown.
• Level 14: You gain Greater Creeping Cold as an SLA. 10 SP, 8 second cooldown.

Notes:

* The shared spell power (higher of Light and Elemental) granted by elemental domains to "spells" does not seem to extend to non-spell effects, such as Arcane Archer damage or Warlock pact damage (DDO Forums). It also does not apply to spell critical chance.

† Mephits are outsiders, not elementals. Therefore, elemental domains don't grant the ability to turn mephits.