Encounters: The Lowerdark (Underground, Desolate)

Xorn, Elder (CR 8)

Large Outsider (Earth and Extraplanar)
Alignment: Usually neutral
Initiative: +0; Senses: all-around vision, darkvision 60 ft., tremorsense 60 ft., Listen +18, and Spot +22

AC: 25 (-1 size, +16 natural), touch 9, flat-footed 25
Hit Dice: 15d8+63 (130 hp); DR: DR 5/bludgeoning
Fort +13, Ref +9, Will +9

Speed: 20 ft., burrow 20 ft.
Space: 10 ft./10 ft.
Base Attack +15; Grapple +26
Attack: Bite +21 melee
Full Attack: Bite +21 melee and 3 claws +19 melee
Damage: Bite 4d8+7, claw 1d6+3
Special Attacks: -

Abilities: Str 25, Dex 10, Con 19, Int 10, Wis 11, Cha 10
Special Qualities: earth glide, cold and fire immunity, electricity resistance 10
Feats: Awesome Blow; Cleave; Great Cleave
Skills: Hide +14, Intimidate +18, Knowledge (dungeoneering) +18, Listen +18, Move Silently +18, Search +22, Spot +22, and Survival +18 (+20 following tracks or underground)
Advancement: 16-21 HD (Large); 22-45 HD (Huge)

Climate/Terrain: Elemental Plane of Earth
Organization: Solitary, pair or party (6-11)
Treasure: None

Source: Monster Manual

Burrow (Ex): A xorn can glide through stone, dirt, or almost any other sort of earth except metal as easily as a fish swims through water. Its burrowing leaves behind no tunnel or hole, nor does it create any ripple or other signs of its presence. A move earth spell cast on an area containing a burrowing xorn flings the xorn back 30 feet, stunning the creature for 1 round unless it succeeds at a Fortitude save.

Xorn qualities

Immunities (Ex): Xorns are immune to fire and cold.

Resistances (Ex): Xorns have electricity resistance 10.

Half Damage from Slashing (Ex): Slashing weapons deal only half damage to xorns, with a minimum of 1 point of damage.

All-Around Vision (Ex): Xorns' symmetrically placed eyes allow them to look in any direction, bestowing a +4 racial bonus to Spot and Search checks. Xorns can't be flanked.

Tremorsense (Ex): Xorns can automatically sense the location of anything within 60 feet that is in contact with the ground.

Underdark Encounters