Domains: Winter-as-entropy, emotional vampirism, the cold that hollows.
Era of ascension: Great Expansion. Cohort: current. Kryviel and the Ikriel co-emerged after the Frost Fall, in the long cold that followed; the worship and the predator-form arrived together, and the priests do not distinguish which produced which.
Worshipped by: The Ikriel, in the scattered predator-groups of the frozen reaches. There is no central temple. Each band carries its own shrine — a small, cold object — and the worship is conducted at every feed. (The worships edge is authored downstream on the worshipper, not here.)
She is the cold that takes. The Ikriel doctrine — and the patron's, on the band-elders' account — is that every relationship is finally transactional, a question of when rather than if, and the feed is the moment the relationship resolves into the form it always had. The Ikriel do not feed on blood. They feed on the warmth a body produces by feeling something — affection, fear, grief, hope — and the feed leaves the source emptied of that particular feeling, sometimes for hours, sometimes permanently. A band that has worked a small village for a season leaves it functional but flattened: the villagers continue their work, do not weep at their losses, do not smile at their reunions, and do not understand why the children seem distant.
She is not Ystaeria. Ystaeria is the Istori patron of mathematical cold, the cold that preserves what passes through it — the ice-glass forge whose crystallizations hold their form for centuries. Kryviel is the cold that does the opposite. She does not preserve. She removes. Where Ystaeria's worshippers leave behind a precise, lasting object, Kryviel's leave behind a person who can no longer remember why they used to care. The two patrons share a written domain on outsider taxonomies of cold-gods and have nothing further in common. An Ikriel band that crossed paths with an Istori forge-temple would find the cold thin and the patrons of it irrelevant; an Istori priest who walked into an Ikriel hunting-ground would find the cold the same temperature but understand immediately that the temperature was being put to a different purpose.
The grim weight is that the Ikriel are not sadistic. They are hungry, and the hunger has a doctrine, and the doctrine names what the hunger is for. A band-elder explaining the patron to an outsider will use the phrasing the priests use among themselves: every relationship is a contract whose terms will be exercised, and the patron is the witness who confirms when the exercise begins. The outsider usually asks whether love is exempt. The elder usually answers that love is the contract the patron most prefers to witness exercised.