Task, Duty
You use a special spear in winter to give yourself the power to do all of your tasks.
It's hard to get a task done in winter. That's why you have this spear to power and motivate you.
む
つと
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Your task is to spear this cow. "Moo (む)!" it yells at you and runs away. You need to make dinner though... that's your task, so you better catch up to that cow and put an end to its mooing.
The moo haunts you as you finish your task. Luckily this spear is helping you keep going even though this task is really difficult.