Koshin Serpent1
What initially appeared to be many serpents is in fact a single creature, consisting of eight snakes fused together. The immense tail of this creature ends in a mighty, sword-like blade.

Koshin Serpent (CR 7; XP 3,200)
NE Huge magical beast
Init +7; Senses darkvision 60 ft., low-light vision; Perception +13
Defense
AC 21, touch 11, flat-footed 18
(+3 Dex, +10 natural, -2 size)
hp 94 (9d10+45); fast healing 9
Fort +11, Ref +9, Will +6
Offense
Speed 30 ft.
Melee 8 bites +14 (2d6+7 plus poison), tail sword +14/+9/+3 (4d6+3)
Space 15 ft.; Reach 10 ft.
Special Attack tail sword
Special Attacks
Str 24, Dex 17, Con 21, Int 4, Wis 13, Cha 7
Base Atk +9; CMB +18; CMD 31 (can’t be tripped)
Feats Combat Reflexes, Improved Initiative, Iron Will, Lunge, Snatch
Skills Perception +13, Stealth -5 (-1 in desert); Racial Modifiers +4 Stealth in deserts
Ecology
Environment desert
Organization solitary
Treasure standard
Special Attacks
Poison (Ex) Bite—injury; save DC 19; frequency 1/ round for 4 rounds; effect 1d2 Constitution damage; cure 2 consecutive saves. The save DC is Constitution-based.
Tail Sword (Ex) The tail of a koshin serpent is a huge greatsword. The tail slash attack is treated as a primary weapon that allows iterative attacks. A koshin serpent may not use its tail slash attack against a creature it is biting.

In the hottest parts of the desert koshin serpents make their lairs. Voracious creatures, a koshin serpent that senses prey within its territory will hunt its prey for miles. Often they will seek to weaken their prey with its poisonous bites before slicing up its food with its greatsword tail.

Rumors persist among desert folk that the tail sword of the koshin serpent more readily takes enchantments than traditional weapons. Additionally, some travelers have insisted that one sure fire way to escape death at the fangs of a koshin serpent is to appease it with gifts of beer and other liquors.

On Porphyra
Deep within the Ghadab there is said to dwell a koshin serpent of mythic size and power. This serpent is more intelligent and is said to possess eight bladed tails as well as eight heads. It is said to be so old that it predates the worship of the Elemental Lords. Many seekers have wandered the deserts of the Ghabad to seek its advice and wisdom.