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    Isopod, Giant

    This beetle-like crustacean is the size of a sewer rat; a row of overlapping plates protects it as it scuttles about on fourteen rapidly moving legs.

    Giant Isopod CR 1/8

    XP 50
    N Tiny vermin (aquatic)
    Init –1; Senses darkvision 60 ft., low-light vision; Perception +4


    AC 14, touch 11, flat-footed 14 (–1 Dex, +3 natural, +2 size)
    hp 6 (1d8+2)
    Fort +4, Ref –1, Will +0
    Defensive Abilities curl; Immune mind-affecting effects


    Speed 20 ft., swim 10 ft.
    Melee bite –1 (1d3–3)


    Str 5, Dex 9, Con 14, Int —, Wis 10, Cha 2
    Base Atk +0; CMB –3; CMD 4 (28 vs. trip)
    Skills Perception +4, Swim +5; Racial Modifiers +4 Perception


    Curl (Ex)

    As a standard action, a giant isopod can curl into a ball, increasing its natural armor bonus by +2 but preventing it from taking any move actions. Uncurling also requires a standard action.

    Editor's Note
    A Giant Isopod can become a familiar.  If so, its Master gains a +1 natural armor bonus to AC.
    Source Wikipedia