race features:
Fire Divers: As a Bonus Action you can become Immune to Fire Damage for 10 min + Constitution Modifier + Proficiency. This can only be used once per Long Rest and grants a level of Exhaustion after the time is over.
Steam Jets: As a Bonus Action you can shoot dual steam jets from vents by your achilles tendons. In water this will give you +60ft more movement this turn. Out of water it doubles all your Jumping Distances. This can only be used once per Short Rest.
Water Wielding: You receive no penalties for wielding weapons underwater according to the rules of Underwater Combat.
"Brokon come from around and under the Azle Isles in the Broken Sea. Their ancestors were so harried by the additional predators that swam around the islands they took to diving deep into the volcanic vents and ravines to greet the threats before they emerged. Vicious and brutal, these Mermon tend to have smaller ear fins and eyes then other Mermon."