This colorful, one-horned fish bristles with long, hairlike tendrils.
AC 24, touch 11, flat-footed 21 (+3 Dex, +13 natural, –2 size)
Speed 20 ft., swim 50 ft.
At will—detect evil (as free action) (1st), light (0)
Str 26, Dex 16, Con 21, Int 6, Wis 13, Cha 11
Environment any aquatic (the Abyss or Heaven)
Dimension Lock (Su) The hairlike tendrils that cover the body of a unicorn fish extend into higher dimensions like a mystical web, continually duplicating the effects of a dimension lock spell (CL 13th), except the effect is centered on the unicorn fish and does not prevent the unicorn fish from using its swim the abyss ability. The unicorn fish cannot suppress this ability.
Holy Attacks The damage dealt by a unicorn fish's attacks, and by its swallow whole ability, counts as good-aligned for the purpose of overcoming damage reduction and regeneration.
Swallow Whole (Su) Whenever a unicorn fish's swallow whole ability would deal damage, the unicorn fish may choose for that ability to deal lethal damage, nonlethal damage, or no damage at all. A unicorn fish may release a creature it has swallowed whole as a free action.
Swim the Abyss (Su) Twice per day as a standard action, a unicorn fish can enter the Abyss or Heaven. This functions as plane shift spell (CL 13th, DC 17) that targets the unicorn fish and every creature currently subject to its swallow whole ability.