Actions

Multiattack. The Sea Spawn makes three attacks: two unarmed strikes and one with its piscine anatomy.   Unarmed Strike. Melee Weapon Attack: +4 1d20+4 to hit, reach 5f.t, one taget. Hit: 4(1d4+2) 1d4+2 bludgeoning damage 1d4+2 .   Piscine Anatomy. The Sea Spawn has one or more of the following attack options, provided it has the appropriate anatomy:

• Bite. Melee Weapon Attack: +5 1d20+5  to hit, reach 5ft., one target. Hit: 4 (1d4+2) 1d4+2 bludgeoning damage.
• Poison Quills. Melee Weapon Attack: +5 1d20+5 to hit, reach 5ft., one creature. Hit: 3 (1d6) 1d6 poison damage, and the target must succeed on a DC 12 Constitution saving throw or be poisoned for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
• Tentacle. Melee Weapon Attack: +5 1d20+5 to hit, reach 10ft., one target. Hit: 5 (1d6+2) 1d6+2  bludgeoning damage, and the target is grappled (escape DC 12) if it is a Medium or smaller creature. Until this grapple ends, the Sea Spawn can't use this tentacle on another target.