Typical Undersea Weapons

Name	Cost	Damage	Weight	Properties
Simple Weapons, Melee Weapons
Dagger	2gp	1d4 piercing	1lb	finesse, light, thrown (range 20/60)
Javelin	5yp	1d6 piercing	2lb	thrown (range 30/120)
Spear	1gp	1d6 piercing	3lb	thrown (range 20/60), versatile (1d8)
Simple Weapons, Ranged Weapons
Dart	5wp	1d4 piercing	0.25lb	finesse, thrown (range 20/60)
Shalarin light crossbow	25gp	1d6 piercing	2lb	ammunition (range 80/160), special, two-handed
Martial Weapons, Melee Weapons
Gaff/Hook	2gp	1d4 piercing	2lb	special
Greatspear	2gp	2d6 piercing	5lb	heavy, two-handed
Lance	10gp	1d12 piercing	6lb	reach, special
Longspike	15gp	1d8 piercing	3lb	versatile (1d10)
Urchinstar	15gp	1d8 piercing	4lb	-
Pike	5gp	1d10 piercing	18lb	heavy, reach, two-handed
Sharktooth Blade	35gp	1d8 slashing	3lb	finesse, special
Tarpal	30gp	2d4 slashing	4lb	finesse
Trident	5gp	1d6 piercing	4lb	thrown (range 20/60), versatile (1d8)
Shalarin Trident	5gp	1d6 piercing	2lb	finesse, light
Martial Weapons, Ranged Weapons

Harpoon	3gp	1d6 piercing	6lb	special, thrown (range 20/60)
Net	1gp	-	3lb	special, thrown (range 5/15)
Shalarin heavy crossbow	50gp	1d8 piercing	2b	Ammunition (range 150/300), heavy, special, two-handed

In addition to these weapons, surface weapons may be purchased or scavenged.
Special Weapons Rules
Gaff/Hook. A large or smaller creature hit by a gaff is kept in the same position and cannot use their Move action unless they inflict 1d4 damage on themselves. The wielder of the gaff must pass a DC10 strength check to remove the gaff once it is embedded in its target. Removing the gaff like this inflicts 1d4 damage and utilizes either an action or bonus action.
Harpoon. While underwater and making a ranged attack with a harpoon against a target within normal range, the attack role does not have disadvantage.
When you use an action to make a ranged attack with a harpoon, if you hit a creature that is up to one size larger than you, you can use a bonus action to attempt to pull the creature towards you. The creature must succeed a contested Strength check against you or be pulled up to 20ft towards you.
Lance. You have disadvantage when you use a lance to attack a target within 5ft of you. Also, a lance requires 2 hands to wield when you are not mounted. 
Net. A Large or smaller creature hit by a net is restrained until it is freed. A net has no effect on creatures that are formless, or creatures that are Huge or larger. A creature can use its action to make a DC 10 Strength check, freeing itself or another creature within its reach on a success. Dealing 5 slashing damage to the net (AC 10) also frees the creature without harming it, ending the effect and destroying the net. When you use an action, bonus action, or reaction to attack with a net, you can make only one attack regardless of the number of attacks you can normally make.
Shalarin Crossbows. While underwater and making a ranged attack with a shalarin crossbow against a target within normal range, the attack roll does not have disadvantage. If taken out of the water for more than 1 turn, a shalarin crossbow will be able to fire 1 shot and will then disintegrate.
Sharktooth Blade. While underwater and making a melee attack with a sharktooth blade, the attack roll does not have disadvantage, even if you don’t have a swimming speed.


Weapons are from or modified from Under The Seas of Voldari and The Sea of Fallen Stars