Trillith

Large Aberration (Incorporeal)
Hit Dice: 7d8+14 (45 hp)
Initiative: +0
Speed: Fly 40 ft. (perfect)
Armor Class: 16 (–1 size, +7 deflection) touch 16, flatfooted 16
Base Attack/Grapple: +5/+16
Attack: Incorporeal slam +5 melee (1d6+10), or slam +12 melee (1d6+10)
Full Attack: Incorporeal slam +5 melee (1d6+10), or slam +12 melee (1d6+10)
Space/Reach: 10 ft./10 ft.
Special Attacks: Spellcasting
Special Qualities: Damage reduction 10/special, darkvision 60 ft., spell resistance 20, telepathy 100 ft., blindsight 60 ft., song weakness
Saves: Fort +4, Ref +2, Will +9
Abilities: Str 24*, Dex 10, Con 14, Int 10, Wis 14, Cha 24
Skills: Concentration +12, Sense Motive +5, any one of Bluff, Diplomacy, or Intimidate +17
Feats: Iron Will, Psionic Mage, Skill Focus (Sense Motive)
Environment: Any
Organization: Solitary or torment (1 greater trillith, 2–5 intermediate trillith, and 5–12 lesser trillith)
Challenge Rating: 7
Treasure: None
Alignment: Often neutral evil
Advancement: 8–12 HD (lesser), 13+ HD become intermediate or greater trillith
Level Adjustment: —
* The Strength score listed for the trillith applies only when the trillith is manifested in corporeal form.

Combat
Lesser trillith are incapable of dealing damage with their psychic powers, so they prefer to weaken foes with magical attacks against their minds. When a foe is incapacitated, the trillith will assume physical form to deliver a killing blow.

Spellcasting: A lesser trillith knows Charm and Compel spell lists for Aberration, Dragon, Elemental, Fey, Giant, Humanoid, Magical Beast, and Monstrous Humanoid. It also knows Evoke Life and Transform Life, plus any one non-Evoke spell list appropriate to its nature. It can cast spells using those spell lists as a standard action, with a caster level and MP Limit of 7. The save DC against these spells is 10 + ½ the spell’s MP cost + the trillith’s Charisma.

A lesser trillith that casts a spell cannot cast another spell in the next round, as it must reestablish its psionic focus. It typically spends these interim rounds maneuvering and speaking with its foes.

Manifest (Su): As a full-round action, a lesser trillith may assume physical form by placing its spirit within some sort of solid matter that is approximately large size, and is not firmly attached to a larger object. While in physical form, the trillith typically has a land speed of 40 ft. If the trillith animates a dead creature, it gains any natural movement abilities that creature had.

The trillith loses its deflection bonus to AC, but gains a natural armor bonus of at least +4, possibly higher depending on the nature of its form. Additionally, the trillith may gain a gore attack that does 1d8+10 damage.

The trillith can return to incorporeal form as a full-round action.

Blindsight (Su): The trillith’s blindsight ability only allows it to see creatures with an Intelligence score of 3 or higher, and only those that can dream.

Damage Reduction: A trillith is vulnerable to materials that are opposed to its essence, so a trillith that is the incarnation of Fury might only take normal damage from weapons used while fighting defensively, the incarnation of Indomitability might only take normal damage from weapons made of bone or wood (once-living things that have succumbed), and the incarnation of Seeing Others Suffer In Your Place might only take normal damage from weapons that have harmed their wielder.

Song Weakness: A rare song created by a group of underground fey has the power to force trillith into solid form. Only those who speak Sylvan and know the Compel Aberration spell list can learn the song of the fey. When a creature sings the song of the fey, it makes a Perform check, and all trillith who hear the song must succeed a Will save (DC equal to the Perform check’s result) or else they are compelled to manifest to corporeal form on their next action. They cannot become incorporeal again for as long as they hear the song. If the trillith succeeds its Will save, it cannot be affected by that creature’s song again for a day.

Skills: A trillith can take 10 on Concentration checks to become psionically focused.

Culture: Trillith are most common underground. Some scholars theorize a great slumbering creature is constantly creating new trillith from its dreams, but it is quite possible that trillith are simply drawn to dark places.

Though many of their ways are unknowable to humans because of their incorporeal nature, the trillith do have one very tangible tradition, the Trillith Masquerade. Whenever a solar eclipse occurs on the surface, all the trillith that are able gather in a grand underground festival, bringing the most elaborate and beautiful physical forms they can find. Some simply wear the skin of weeks-dead creatures, splendid in their decay. Others gather bits of gems and metal into their bodies, and come as something like living sculptures. The purpose of the masquerade is to assume a physical form that is entirely distinct from the trillith’s aspect name. Because trillith are so innately tied to the dream that gave birth to them, it is a great challenge for them to have other roles. The masquerade is the closest thing to a religious ritual trillith are known to have.