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Unfathomable! Bestiary: Thrantrix the Ineffable statblock

Thrantrix is a godling newly born of Primal Chaos. Like most godlings, her colossal ego cries out for approbation and the worship.

I am adapting B/X creatures from  Operation Unfathomable! and Odious Uplands!, by Jason Sholtis.

In converting statblocks to 5e, I have relied on three tools: Open5eFlee, Mortals!, and Forge of Foes

Thrantrix the Ineffable 

Thrantrix appears to be a giant, hovering ball of knotted, writing snakes. Green and blue aurora borealis plays across her surface. She speaks in a voice that is both booming and warbling.

Large aberration
AC 18    HP 250    Speed fly 20' (hover)
STR 0    DEX +3    CON +4    
INT +4    WIS +3    CHA +6

Saving Throws Int +9, Wis +7, Cha +9  
Skills Intimidation +9, Perception +7  
Condition Immunities charmed, flanked, frightened, prone 
Senses darkvision 120 ft., truesight 30', passive Perception 17  
Language Common, Undercommon, the languages of the gods above and the gods below 

Serpentine Sacrifice (3/Day). If Thrantrix fails a saving throw, she can sacrifice some of the writhing snakes that form her body and succeed instead. Doing so eliminates one of her Chaos beams (chosen by rolling a d6).  The sacrificed snakes and Chaos beam regenerate 24 hours later.


Bites. +5 to hit, target all in melee range, (2d6) piercing dmg + (2d6) poison dmg.

Chaos Beams. 3 beams, range 120'. Can’t use the same effect twice in a turn.

1. Charm Beam. WIS 17 Save or be charmed by Thrantrix for 1 hour, or until she harms the creature or one of their allies.

2. Confusion Beam. INT 17 Save or the target must use their reaction, if available, to move toward the closest ally they can see and make one weapon attack against them. Creatures who can’t be charmed are unaffected.

3. Memory Beam. INT 17 Save or expend a spell slot of their highest remaining level, with no effect. If they don’t have unexpended spell slots, they instead lose proficiency with a weapon they’re holding or carrying for 1 minute.

4. Telekinetic Blast. Thrantrix chooses a point she can see within 120'. Each enemy within 10' of the point must pass a STR 17 Save or be moved up to 30' in any direction and take (1d6) force damage for every 10' moved at the end of the move. Additionally, Thrantrix can target any object within 10' of the point that weighs 300 pounds or less and isn’t being worn or carried, moving it up to 30' in any direction. 

5. Lightning Bolt. Thrantrix shoots a 5-foot-wide, 60-foot- long line of lightning. Each creature in the line must roll a DEX 17 Save, taking 36 (8d8) lightning damage on a failed save, or half as much damage on a successful one.  

6. Necrotic Beam. CON 17 Save or immediately take (10d10) necrotic damage and lose (2d6) hit points at the start of each of their turns. If this effect reduces a target’s hit points to 0, they die. The effect ends if Thrantrix dies or can’t see the target. This psionic effect can’t be used again while this effect persists.


Nul Beam (Recharge 6). Thrantrix projects a 150-foot cone of energy. If Thrantrix or any creature in that area is affected by a spell, the spell’s effects immediately end for that creature.


Cower! When a creature hits Thrantrix with an attack, she shoots a psionic fear beam at them. The creature must succeed on a DC 17 Wisdom saving throw or take 21 (6d6) psychic damage and be frightened of Thrantrix for 1 minute (save ends at end of turn).


Thrantrix has 3 legendary actions. She can take each action once during an encounter after an enemy’s turn. She can take these actions in any order but can use only one per round.

1. Punish the Unbelievers. Any worshippers within 60' of Thrantrix who can hear her can make a melee attack without expending an action.

2. Ecstatic Dance. Thrantrix and each worshipper within 60' who can hear her can move up to their speed without provoking opportunity attacks. 

3. Move in Mysterious Ways. Thrantrix turns invisible until the end of her next turn and teleports up to 120 feet to an unoccupied space he can see.


Currently, she is occupied by experimenting with the universe around her, seeking to understand her own power and her place in the Underworld. 

Her personality is still a work in progress. The Ineffable One remains largely unintelligible in conversation, as she is inexperienced in the subtleties of communicating with beings of lesser cosmic awareness. Thrantrix still attempts to command praise from unintelligent creatures like giant pill bugs, blasting them to smithereens when they fail to fall to their many knees. 

She demands praise, worship, and unquestioning obedience from all she encounters and will settle for nothing less. Only by speedy retreat can characters hope to avoid either her service or her wrath.

Her ranging consciousness has detected the recent distress of wounded godling Shaggath-Ka. Sensing weakness, Thrantrix makes her way toward the Worm Sultan’s lair, where she hopes to destroy her rival and lay claim to his flock. In so doing, Thrantrix has found herself frequently distracted by the plentiful wonders of the depths. 

Sample Dialog:

“I am all that I comprehend! All that enters my perception is a part of my realm!”

“Your lives are inert matter meant only to extend my will!”

“The very movement of your blood shall be an expression of my will!”


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