Horsespider
Large Magical Beast
Hit Dice: 5d10+10 (37 hp)
Initiative: +2
Speed: 60-ft (12 squares), climb 20-ft
Armor Class: 15 (-1 size, +2 Dexterity, +4 natural), touch 11, flat-footed 13
Base Attack/Grapple: +5/+13
Attack: Bite +8 melee (1d6+6 and poison) or web +6 ranged touch (entangles, 10-ft range increment max 50 ft)
Full Attack: Bite +8 melee (1d6+6 and poison) or web +6 ranged touch (entangles, 10-ft range increment max 50 ft)
Space/Reach: 10 ft/5 ft
Special Attacks: Poison, Transdimensional Web
Special Qualities: Darkvision 60-ft, Transdimensional Sight
Saves: Fort +3, Ref +6, Will +5
Abilities: Str 19, Dex 15, Con 15, Int 2, Wis 12, Cha 8
Skills: Balance +4, Climb +12, Jump +16 (+20 running jump), Spot +11
Feats: Ability Focus (Poison), EnduranceB, Run
Environment: Warm and temperate hills and plains.
Organization: Solitary, or pair
Challenge Rating: 3
Treasure: None
Alignment: Always True Neutral
Advancement: 6-8 HD (large)
Level Adjustment: -

The creature before you looks like some strange mix of the equine body form and an insect. While it has a horse's neck, a sturdy torso, and its long head with a muzzle-like snout is reminiscent of a horse's long face that is where the resemblance ends. Its body is covered in chitin, eight eyes clustered on its face, and a pair of chelicerae hang from its mouth. It has eight long, stilt-like legs making it disproportionately tall for its body mass.

Horsespiders are a strange variety of magical beast which dwells in steppes, plains, and gentle hills. They are quick runners, sometimes domesticated by hobgoblins as mounts for their cavalry. Horsespiders are capable of spinning webs, but rarely live inside of their webs in the wild, instead living a migratory life as hunters, roaming the plains for food and rarely staying in one den long enough to build a web. Horsespider stables, however, soon end as a maze of webs.

While the origin of horsespiders is unknown some suspect it had to do with a planar nexus site, thus explaining their ability to see into conterminous planes. Others blame wizards, stating that it began as an experiment in trying to create a race of creatures to serve as sentries against other ethereally invasive wizards. The world might never know.

Combat:
Horsespiders use their speed to run down prey, striking it with their venomous fangs and then withdrawing only to rush forward and bite again when the poison has fully set in. They have been known to follow, and harry, prey for hours as they let the accumulated wounds and poison do their work.

Poison (Ex): A horsespider's bite carries a weakening poison which deals 1d6 Strength damage as both initial and secondary damage. A Fort save (DC 16) is required to resist.

Transdimensional Sight (Su): A horsespider is able to see invisible creatures (as if with the See Invisibility spell) as well as peer into any planes conterminous to the plane they currently are upon. They are able to recognize whether something is visible or invisible and what plane something exists upon, vision in one plane not blocking vision on another in any way.

Transdimensional Web (Su): A horsespider is able to cast webs much like web-spinning spiders up to 8 times per day. This is similar to an attack with a net but has a maximum range of 50 feet, with a range increment of 10 feet, and is effective against targets up to one size category larger than the spider. An entangled creature can escape with a successful Escape Artist check (DC 14) or burst it with a Strength check (DC 18). Both are standard actions and the check DCs are Constitution-based, with the Strength check DC including a +4 racial bonus. A horsespider gains a +4 bonus on opposed Strength checks to restrain a creature's movement, and may drag a creature whose movement it restrains. Dragging a creature slows a horsespider as if it were carrying that creature's weight. As a large eight legged creature a horsespider can carry 348 lbs without being slowed, 699 lbs with a 40-ft speed, 1050 lbs with a 40-ft speed and x4 running speed (x3 without Run feat), and drag up to 5250 lbs.

If a horsespider moves they may cast their web at any point during their movement as a standard action. A horsespider can cast its web in any or all planes that are conterminous to its own in addition to or instead of the plane it currently is on. In this way a horsespider may use its web to entangle an ethereal creature and even drag it off.

For Players:

A horsespider might be appropriate as an alternate paladin mount instead of another CR 3 option (effective paladin level -1). Horsespiders are most appropriate for Paladins of Slaughter who worship Lolth, or hobgoblin paladins of tyranny.