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> Spiky chains lash a fifteen-foot-diameter, floating blob of quivering flesh to a 20-foot-tall wrought-iron scaffold. Two fiends wrapped in chains stand atop the scaffold, torturing the bloated creature's flesh by tightening its chains. Demon ichor oozes from its wounds, forming a shallow pool around the scaffolding.
>
> A third, jackal-headed fiend uses a bronze horn to yell loudly at the bloated prisoner in multiple languages. It sits cross-legged about half-way up the scaffolding.

All three fiends are immune to the sibriex's Warp Creature power.
In the pockets of Fetchtatter's bile-stained robe are two potions of greater healing and six soul coins. The arcanaloth also carries a grimy spellbook bound in chasme flesh. Fetchtatter's spellbook contains all the spells the arcanaloth has prepared.

Each chain has AC 19, 33 hit points, a damage threshold of 10, and immunity to fire, poison, and psychic damage.

Fetchtatter uses its speaking horn to address the sibriex, treating it like an idiot child
Fetchtatter offers 3 soul coins to get the Sibriex to talk, wanting to know about Weslocke so he can kill her and take her position.

The sibriex uses its telepathy to contact the first party member who comes within 120 feet of it, offering information in exchange for its freedom. 
The character with whom the sibriex is speaking telepathically can detect the insincerity of the sibriex's offer with a successful DC 17 Wisdom (Insight) check. 
Contrary to its claim, the sibriex doesn't plan to help the characters.

A character can, with a successful DC 17 Charisma (Deception or Persuasion) check, convince the sibriex to share one bit of useful information as a show of good faith.

The Sibriex offers information in exchange for its freedom. 
It knows info about Weslocke, Bathym, or other Avernus locations.

> For each level of the spell, the process takes 2 hours and costs 50 gp

Fireball\
Wall of Fire\
Dimension Door\
Counterspell