Actions/Abilities/Traits: (Pathfinder 2e)
Ability
Attack of Opportunity [Reaction]
Stinger only.
Ability
Chitinous Spines
A creature grabbed by the spiny eurypterid takes 2d6 piercing damage at the start of that creature's turn.
Ability
Spiny Eurypterid Venom
(poison) Saving Throw Fortitude DC 22; Maximum Duration 6 rounds; Stage 1 1d8 poison damage and enfeebled 1 (1 round); Stage 2 1d8 poison damage and enfeebled 2 (1 round); Stage 3 2d8 poison damage and enfeebled 3 (1 round)
Offense
Melee
Circumstance: combat round (melee)
pincer +15 [+10/+5], Damage 2d8+4 slashing plus Grab
Trait
Amphibious
An amphibious creature can breathe in water and in air, even outside of its preferred environment, usually indefinitely but at least for hours. These creatures often have a swim Speed. Their bludgeoning and slashing unarmed Strikes don't take the usual -2 penalty for being underwater.
Trait
Animal
An animal is a creature with a relatively low intelligence. It typically doesn't have an Intelligence ability modifier over -4, can't speak languages, and can't be trained in Intelligence-based skills.
Perception
darkvision
wavesense (imprecise) 30 feet