As far as size goes, it's essentially a standard blacksmith hammer - comparatively short shaft, the hammer head slightly outsized - and as for powers, the default one is adding extra time to the countdown clock, which has no effect in an RP setting where crafting is not a timed minigame.

Basically it's just a really good hammer that she is personally fond of rather than anything magical. The most unusual thing about it is that it was made by yetis.