Retiarius

Usually a fighter hailing from the high seas or costal regions, the Retiarius is a deadly force. Many of these fighters gain fame through battling in the pits as gladiators. These fighters get one up on their opponents in any aquatic situation. They also use their skills to gain mastery on entrapment and entanglement. Their preferred weapons are spears and tridents, which allow them to easily dispatch anything they have caught.

Neptune's Mastery

These fighters gain bonuses to their attacks while they are wielding a trident(or spear like item). When using a trident they add their DEX modifiers as a bonus to attack rolls (both to hit and to attack). These fighters are at home in the water and on ships and gain advantage on all DEX saving throws.

Spellcasting

Choose three cantrips  from the wizard class. Besides special spells given through leveling up, they don't learn any other spells.

Snare of the Sea

Creatures now have disadvantage on trying to avoid your thrown nets. You also force a DEX saving throw at a 12 Dc. You also deal 1d6 bonus damage to restrained targets.

Blessing of Neptune

You can choose either Improved criticals or Rejuvenation of Neptune.

Improved Criticals

You now critical hit on 19s or 20s

Rejuvination of Neptune

Once per long rest, you have the ability to heal yourself as if you took a short rest when you are in contact with water of any kind.

Horrors of the Deep

Once per day you may cast Horrors of the deep

Armory of the sea

You are able to choose between Leviathan's Hide or Neptune's Trident.

Leviathan's Hide

While your health is above 50% your Ac is set to 15, your DEX modifier is set to +5, and you deal an extra 1d6 damage to every attack. Once your health drops below 50% your ac is set to 18, you gain resistance to all physical attacks, and get advantage on all saving throws.

Neptune's Trident

A blue trident tipped with gleaming golden spear heads. The trident does a base 3d6 piercing damage and does 3d6 cold damage. You can use a bonus action to change the cold to force or thunder damage. After every short rest you get three charges of Electrical conduit. You call down a strike of electricity onto an opponent. They must make a 15 Dc DEX saving throw. On a failure they take half damage, on a success they take 3d10 thunder damage.

Boon of Neptune

You gain the ability to summon a water elemental once per day. It disappears when it dies, if the caster dies, falls unconscious, or dispels it.