Answer:
I open wide and tight I shut, Sharp am I and paper-cut fingers too, so do take care, I'm good and bad, so best beware.
Though I wander the earth, I am no longer here. I am pale and I chill everyone near. Who am I?
Hold the tail, while I fish for you.
It can pierce the best armor and make swords crumble with a rub, yet for all its power It can't harm a wooden club.
I have legs but never walk, I may have flowers but no soil, I hold food but never eat.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?