[Volaire, Pathfinder E6] Ishtarian Serpents

In Volaire, fiends do exist, but they are considered rare threats. Cultists can pool their resources and ritually summon energies from dark dimensions, but imps are among the most powerful fiends they can pull wholly into our dimension. It's generally more efficacious to use said energies to corrupt an extant being, generally a beast, as sentient minds don't react well to such corruption. Operating in such a manner over the span of years can twist the environment, leaving traces in the land itself. Over the span of generations, the uninterrupted work of dark cultists on a large scale can pollute entire ecologic regions.

The planet Unas is a world where rampant, uncontrolled channeling of extraplanar energies had gone unchecked for a century by a corrupt government who ignored the existential threat. The Moon Gate of Quag Keep, once the gleaming jewel of the system, was disrupted by a rival faction in an attempt at sabotage; resulting in a domino effect in an already magically unstable region that opened what is known as a Hellmouth, a permanently torn rift in space. The larger a Hell Mouth, the more powerful the fiend that can fit through. The Hell Mouth of Ishtar is the largest known in the Tapestry, and one of several such entities that came through is what is colloquially known as the Ishtarian Serpent. Academics call it a Thethtu.

O flower heart hides within a serpent’s face!

The gate is barred! Smash the door, shatter the bolt.

Life becomes death. Death becomes life.

• Cataclysm of Quag Keep, Epistle of Milo

Thethtu are exceptionally dangerous fiendish serpents; between five & six feet wide and roughly a hundred feet long. Most dangerous is Thethtu venom, which will enslave escalating loyalty to the serpent, animating their corpse if they die while it courses through their veins. As zombies are accrued, they move about like ants in service to their queen; protecting the serpent and its territory, seeking living creatures to subdue and drag to the serpent for conversion, etc.

Thethtu, Ishtarian Serpent [CR 6]

Gargantuan outsider (evil)

Init +1; Senses DV 60’, Notice +6; Spd 40’, 40' climb (compression); Reach 20’ (30’ tail)

hp 68 (5d8+45); AC 19 (+12 nat, +1 Dex, -4 size); SV Fort +13, Ref +2, Will +3

Immune mind-affecting; Resist cold/fire 10; DR 5/good; SR 11

Melee bite +10 (2d8+11 plus poison), tail slap +5 (1d4 nonlethal plus trip)

Stats 33.13.29.-.14.6; BAB +3; CMB +18; CMD 28 (cannot be tripped)

Skills Climb +19, Notice +6, Stealth +0

Ishtarian Poison (Su) When exposed to the poison, the victim must make a DC 21 Fortitude save or be unable to attack the Ishtarian serpent, effectively charmed. Every round afterward for the next minute, another Fortitude save must be made or the condition will progress. Failing a second time results in the victim being fascinated by the sight of the Ishtarian Serpent. Failing a third time results in the victim being dominated to serve the serpent for 1d4 hours. If the creature dies while under the effects of this poison, then their body is immediately animated as a zombie with the instinct to serve the serpent.