You might have heard of the Sword of Sharpness before. It’s the baby brother of the Vorpal Sword. One day, if the Sword of Sharpness eats enough iron filings and settles down with the right wizard-smith, it might turn into one. Until that day, it has to be happy with just lopping off limbs when you roll a 20 and dealing extra damage. That’s still pretty cool…but what if the sword was more aquatic themed? Sharp is pretty close to shark, after all.
Sword of Sharkness
Weapon (any sword that deals slashing damage), very·rare (requires attunement)
When you attack a creature with this weapon and roll a 20 on the attack roll, that creature takes damage equal to your weapon damage at the beginning of its turn for each of the for the next 3 rounds.
If a creature under this effect drops equal to or below half of their maximum hit points, you may spend your reaction to cast haste on yourself. This effect does not require concentration, and expires if you have not been attacked or made an attack against a creature at then end of your turn. Once you have used this ability, the sword must be covered in blood and completely submerged in salt water for at least one hour.
If you are completely submerged in salt water when you spend this reaction, allies within 5 feet of you benefit from your haste. The haste on your allies ends when your haste ends.