Vermin Companion: Large Tardigrade

Someone on Facebook this morning said that a player would have fancied a mount like this. There already are Paizo official stats for a tardigrade familiar, so I thought... why not?

A nightmare creature similar to a cross between a bear and a vermin advances slowly on its eight short legs, seeming strangely harmless.

Large Tardigrade, CR 3

XP 800
N Large vermin (aquatic)
Init -3; Senses darkvision 60 ft.; Perception +0

Defense

AC 9, touch 6, flat-footed 9 (-3 Dex, +3 natural, -1 size)
hp 42 (4d8+24)
Fort +10, Ref -3, Will +1
Defensive Abilities hardy; Immune mind-affecting effects; Resist acid 10, cold 10, fire 10

Offense

Speed 20 ft., climb 20 ft., swim 20 ft.
Melee bite +6 (1d8+5)
Space 10 ft.; Reach 5 ft.

Statistics

Str 20, Dex 4, Con 23, Int —, Wis 10, Cha 2
Base Atk +2; CMB +8; CMD 15 (27 vs. trip)
Skills Climb +13, Swim +13
SQ amphibious

Special Abilities

Hardy (Ex): A tardigrade is able to endure extreme conditions for extended periods of time. It is unharmed by extreme cold, extreme heat, and less extreme temperatures. It takes no damage from decompression (such as in the vacuum of space) or high-pressure environments (such as in extremely deep water).

Ecology

Environment any
Organization solitary or pair
Treasure none

Large tardigrades are the product of magic or arcane irradiation. Despite their monstrous appearance, they can be surprisingly docile companions.

Large Tardigrades as Companions

Starting Statistics

Size Medium; Speed 20 ft., climb 20 ft.; AC +1 natural armor; Attack bite (1d6); Ability Scores Str 12, Dex 6, Con 19, Int —, Wis 10, Cha 2; Special Qualities darkvision, hardy, resist acid, cold and fire 5; CMD trip +12.
7th-Level Advancement Size Large; AC +2 natural armor; Attack bite (1d8); Ability Scores Str +8, Dex –2, Con +4; Special Qualities resist acid, cold and fire 10.