Flesh Offering

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That fundamentally doesn't work. A buff-style effect on an entity can't display a timer unless that timer is responsible for it's handling - timers are not purely descriptive/decorative, they define behaviour. The effect on your character is not just on your character - it's removed externally based on the duration of the offering skill, along with the similar effects on other entities.
It isn't a local timer on the effect that we can display. It also wouldn't be able to work correctly with effects such as temporal chains - things on your character that display timer countdowns are things that are affected by temporal chains - this isn't (because the duration isn't actually on your character).