Winter, principle of death, remembrance, unlife, debilitation, and beauty, is an influence with two separate styles working in different ways. As such, the relic/power provided differs with the application that Loki is aiming for. Once he chooses a path, he stays like that until the next day.

If Loki pursues winter with the intention of necromancy, then his relic will be the mori memento, an album containing the photos of whatever has recently passed(or is nearing that point).
Harnessing the freezing power of winter while focusing on one of the photos will push back the moment of death for that person, he can even do this to himself but it drains more winter to work properly.
Alternatively, for a considerable amount of winter, he may remove the photo from the album if they’re already dead to resurrect them, at the cost of the resurrected person(s) rotting away with time until there’s nothing left. Loki cannot do this to himself.

If Loki pursues winter for the powers of the undead, he instead gains the ability to become a silent revenant, a phantom of few words.
Like with I-M, Loki becomes able to possess whatever he comes into contact with, manipulating them, moving them around, and altering them in strange ways as they build up atmosphere while they do so.
The difference being that Loki gains intangibility to compensate for the lack of vision in comparison, and trading the greater form for “greater haunts”, phenomena attributed to more traditional paranormal activity.
This forms main drawbacks consist of: A) a sensitivity to ultraviolet light, B) an inability to communicate without inspiriting a medium capable of allowing such capacity, and C) a metabolism rooted in consuming fear and rotting biomass (or if given the chance, people).

“…” -loki

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