Answer:
I break down buildings, I crumble mountains but you can't see me. What am I?
I let water fall on you while everyone else stays dry.
Draw fire or fill me; I'm still empty.
Light me up in backyard gatherings
I am two-faced but bear only one. I have no legs but travel widely. Men spill much blood over me. Kings leave their imprint on me. I have greatest power when given away yet lust for me keeps me locked away.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?