Answer:
A dragons tooth in a mortals hand, I kill, I maim, I divide the land.
What runs around all day. Then lies under the bed. With its tongue hanging out?
We are few to the wise; We are abundant to the drunken; We can calm the beast and are precious to the child; We can devour the heart, without piercing the skin
I cut through evil like a double edged sword, and chaos flees at my approach. Balance I single-handedly upraise, through battles fought with heart and mind, instead of with my gaze.
I can move even when you are still. I can be one or many.
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?