Hydromancer

Hydromancers are magicians that specialize in the usage of water based magic. Their spells allow them to destroy large groups of enemies with raging torrents or chilling freezes as well as support their allies through soothing healing waters. Typically the hydromancers come from water dwelling species such as Tritons or Genasi. 

Elemental Attunement

Starting at level 2 you have resistance to all sources of cold damage and you are also immune to environmental cold effects such as frostbite. You also are now able to breathe underwater and have an increased swimming speed. 

Hydrolysis

Beginning at level 2, whenever you deal cold damage through a spell or cast the spells Create or Destroy Water or Shape Water, you may make a ranged attack to attempt to deal an extra 1d8 cold damage. 

Flash Freeze

Starting at level 6, Whenever the player would receive physical damage from an enemy, they may return damage as cold damage. The Hydromancer will have to choose whether to specialize in dealing controlled damage dealing 2d4 back to the source of damage or dealing more damage to the entire area dealing 3d4 to the area in a 5ft. radius around the caster. This effect can only be activated once per short rest. 

Area Blast Flash Freeze

Deal 3d4 cold damage to every creature in a 5ft radius as a reaction after receiving physical damage from an enemy attack. 

Single Target Freeze

Deal 2d4 cold damage back to a single target as a reaction after receiving physical damage. 

Crashing Wave

Starting at level 10, If you deal damage with any spell during your turn, as a bonus action you may cast another spell. The second spell must be equal to or less than the spell level of the initial spell cast. This effect has a limited number of charges equal to the Hydromancer's intelligence modifier. Hydromancer regains 1d4 charges after each long rest. 

Master of the Flow

Starting at 14th level, you may choose a specialization to follow. The player can choose between Stormsurge Sentinel which specializes in close range combat, the Seacaster which specializes in more powerful spellcraft, or the Sea Loch which grants the ability to use their magic to provide limited healing and aid to allies. 

Sea Loch

The sea loch has learned how to use their waters to heal and protect their allies to a limited degree granting them access to lower level abjuration magic. the sea loch gains the ability to cast Aid, Sanctuary, and Resistance. The sea loch is also able to unleash a mass healing spell which heals all selected targets within a 30ft radius for 1d8 per spell slot used to cast. If this spell is cast while the sea loch and their target is in the water the healing is doubled. This effect can only be activated once every 1d4 days. 

Stormsurge Sentinel

From  training and exposure to dangerous opponents, the stormsurge sentinel has enhanced their abilities in combat with close range weapons. Through these experiences, these fighters have gained increase armor class and strength scores as well as a proficiency with their weapon of choice, the trident. Also the stormsurge sentinel can channel their magic through their trident allowing them to deal additional damage on a melee attack. Once per long rest, the sentinel may make a single melee attack against targets within a 15ft cone with the trident and on a successful hit deal 3d6 cold damage. If a target is dealt damage with this ability they must make a DC 12 dexterity saving throw and on a failed save are frozen in place for 1d4 rounds.  

Subglacial Sorcerer

The seacaster has perfected their ability to manipulate water in various forms allowing them to shift the damage of any spell they cast into cold damage. The Subglacial sorcerer can may also, once per turn, spend an action to create glacial ice sheets around enemies within a 20ft radius up to 60ft away. Enemies trapped inside are put under extreme pressure and heat by the ice sheets dealing both 2d6 cold and 2d6 fire damage. Creatures must make a DC 14 constitution saving throw and on a successful save take half damage.