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Greetings.
One of the encounters, at sea, is against a sea monster.
Sea serpent
N Huge magical beast (aquatic) (young template) (Pathfinder RPG Bestiary 244)
Init +6; Senses low-light vision, darkvision 120 ft.; Perception +8
DEFENSE
AC 25, touch 10, flat-footed 21 (+15 armor, +4 Dex, –4 size)
hp 157 (15d10+75)
Fort +14, Ref +15, Will +7
Defensive Abilities elusive; Immune cold; Resist fire 30
OFFENSE
Speed 20 ft., swim 60 ft.
Melee bite +23 (3d8+10 plus grab), tail slap +18 (2d6+5 plus grab)
Space 20 ft.; Reach 20 ft.
Special Attacks capsize, constrict (2d6+15), swallow whole (3d8+15
bludgeoning damage, AC 19, hp 18)
As a huge creature, should its space not be 15ft with 15ft reach?
Its bite dice is 3d8, an adult sea serpent 4d8, on Archive of Nethys. Universal Monster Rules entry for bite attacks of huge size is 2d6, and is no further mentioned beyond colossal with 4d6.
What is the reason this creature has a damage potential and size greater than other huge creatures?

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Looks like the damage is right for a generic Sea Serpent with the Young Template, but the author forgot to reduce the space (and possibly, reach) when applying the template's size reduction.