Advanced Bestiary: Gigantean Trilobite

While creating the ooze models for my column two weeks ago, I was inspired to build a trilobite out of some of my less commonly-used black bricks. Here's the result:

As you can see from the grid under it, this trilobite would be Gargantuan if used as a mini. I'm highly unlikely to ever have a use for a prehistoric aquatic vermin that size, but I decided to try to stat one up for Pathfinder anyway. For this, I used the trilobite that appears in Bestiary 5 and the gigantean template from Green Ronin's Advanced Bestiary. Applying this template to a Tiny base creature only results in a Huge creature, so I then added the giant template.

I made one other change when applying the gigantean template. The template only gives +5 to natural armor for a Tiny base creature, which would give the trilobite only AC 12 at Huge size (-2 Dex, +6 natural, -2 size). This is pathetically low, so I used the size normal advancement to calculate the new natural armor bonus instead, which gave a net +9 (for AC 16). I likewise decided to increase the bonus to AC granted by curl to +4 (the same as regular cover) to reflect the larger creature's thicker carapace.

MOTHER OF ALL TRILOBITES (CR 6)

XP 2,400
Giant gigantean trilobite [Advanced Bestiary 160; Pathfinder Role-Playing Game Bestiary 5 113, 289]
N Gargantuan vermin (aquatic)
Init -3; Senses darkvision 30 ft.; Perception +4

Defense
AC 16, touch 3, flat-footed 16 (-3 Dex, +13 natural, -4 size)
hp 187 (15d8+120)
Fort +17, Ref +2, Will +5

Offense
Speed 80 ft., swim 120 ft.
Melee bite +19 (2d8+18)
Space 20 ft.; Reach 15 ft.
Special Attacks trample (2d6+18, DC 29)
Statistics

Str 35, Dex 5, Con 26, Int --, Wis 11, Cha 2
Base Atk +11; CMB +27; CMD 34
Skills Perception +4, Swim +20; Racial Modifiers +4 Perception
SQ curl, water dependency

Ecology

Environment any oceans

Organization solitary, pair, or group (3-12)

Treasure none

Special Abilities
Curl (Ex) As a standard action, a trilobite can curl into a ball, increasing its natural armor bonus by 4 but preventing it from taking any move actions. Uncurling is a standard action.