Javelin-fish

Found in the warm waters of the tropical archipelago the umóks sail from. They fear it more than any other animal. Entire shoals answer to threats by using themselves as living projectiles, creating wounds full of beak splinters. And while someone might escape a shark by going back to the boat, javelin-fishes - which reach a length of one meter or more - jump out of the water at sixty kilometers per hour, impaling themselves so deep that their beaks pierce one's heart.

Swarm of javelin-fish

Large swarm of small beasts, unaligned

Armor Class 13

Hit Points 104 (16d10 + 16)

Speed 0 ft., swim 40 ft.

   STR    DEX     CON    INT    WIS    CHA
10 (+0) 16 (+3) 12 (+1) 1 (-5) 10 (+0) 4 (-3)

Damage Resistances bludgeoning, piercing, slashing from nonmagical weapons
Condition Immunities charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses darkvision 60 ft., passive Perception 10

Challenge 7 (2,900 XP)

• Water Breathing. The swarm can breathe only underwater.
• Swarm. The swarm of javelin-fish can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a Small fish. The swarm can't regain hit points or gain Temporary Hit Points.

ACTIONS

1. Multiattack. The swarm makes two attacks: one with its bites and one with its self-impaling.
2. Bites. Melee Weapon Attack: +6 to hit, reach 0 ft., one creature in the swarm's space. Hit: 21 (6d6) piercing damage, or 10 (3d6) piercing damage if the swarm has half of its hit points or fewer.
3. Self-impaling.The swarm throws itself in a 60-foot line that is 5 feet wide. Each creature in that line must make a DC 13 Dexterity saving throw, taking 21 (6d6) piercing damage on a failed save, or half as much damage on a successful one.The swarm loses 21 (6d6) damage every time it does this.