Segovax stopped praying to anything that would answer honestly years ago. What answers her now keeps its promises exactly as far as the letter of the bargain and not one hair further.
She spends current HP to bind a bele_winddevil ally and permanently sharpens her own attack/damage a little more. No prior 'ally' mechanic in this bestiary is an ACTIVE, REPEATABLE, SELF-COST gamble - Grommash's Herdcall (round 9) is free, and Mother Bellow's Totem Bond (round 9) is a dependency she never chooses to renew.
Her epic Ruin answers, aimed squarely at whoever's been killing them. Trickle her devils down one at a time and there is no backlash at all - the actual counterplay.
Cathedral Level 2's real ceiling was Inquisitor Dravos Kell at CR16 (round 8); Segovax is pitched one notch above at CR17, into the area's most open Sparky headroom of any target this round (5 free slots before this batch).
She is the bestiary's first Diabolist - cloned from fallenpriest, the same corrupted-priest donor round 6/8 used for their own bosses in this cathedral, given Evil and Destruction cleric domains to match a devil-binder's own bent.
Real Epic Spell: Ruin (id 640/878) - Cathedral Level 2 already had Mummy Dust (Malvenna Ash, round 1) and Hellball (Dravos Kell, round 8); Ruin went here, its single-target devastation framed as the wrath of a broken infernal bargain rather than a scheduled climax.