Ur'Epona (CR 1)

Large Magical Beast (Extraplanar)
Alignment: Usually neutral
Initiative: +1 (Dex); Senses: low-light vision, scent, Listen +4, and Spot +4
Languages: UrEpona do not speak, but can understand any language spoken to them.

AC: 13 (-1 size, +1 Dex, +3 natural), touch 10, flat-footed 12
Hit Dice: 3d10+6 (22 hp)
Fort +5, Ref +4, Will +2
Speed: 50 ft.
Space: 10 ft./5 ft.
Base Attack +2; Grapple +9
Attack: Hoof -1 melee
Full Attack: 2 hooves -1 melee
Damage: Hoof 1d6+1
Special Attacks/Actions: -
Abilities: Str 16, Dex 13, Con 15, Int 6, Wis 12, Cha 15
Special Qualities: plane shift
Feats: Endurance; Run
Skills: Listen +4 and Spot +4
Advancement: -
Climate/Terrain: Concordant Domain of the Outlands
Organization: Solitary
Treasure/Possessions: None

Source: Planar Handbook

Plane Shift (Sp): Once per day, an ur'Epona can use plane shift, taking itself and its rider to the plane of its choice. An unwilling rider can resist with a DC 17 Will save. Caster level 9th.

An ur'Epona seeks to avoid combat when possible, though it defends itself and its offspring with dedication. Its hoof attack is treated as a secondary attack and adds only 1/2 the ur'Epona's Strength bonus to damage.

Extraplanar Subtype

A subtype applied to any creature when it is on a plane other than its native plane. A creature that travels the planes can gain or lose this subtype as it goes from plane to plane. This book assumes that encounters with creatures take place on the Material Plane, and every creature whose native plane is not the Material Plane has the extraplanar subtype (but would not have when on its home plane). An extraplanar creatures usually has a home plane mentioned in its description. These home planes are taken from the Great Wheel cosmology of the D&D game (see Chapter 5 of the Dungeon Master's Guide). If your campaign uses a different cosmology, you will need to assign different home planes to extraplanar creatures.

Creatures not labeled as extraplanar are natives of the Material Plane, and they gain the extraplanar subtype if they leave the Material Plane. No creature has the extraplanar subtype when it is on a transitive plane; the transitive planes in the D&D cosmology are the Astral Plane, the Ethereal Plane, and the Plane of Shadow.