Answer:
Vikings use this for warmth.
You heard me before, yet you hear me again, then I die. Until you call me again.
It is worldwide, but once only a spider could weave one
I always follow my brother but you cannot see me, only him. You cannot hear him but you can hear me. What are we?
My first is in wield, sever bones and marrow. My second is in blade, forged in cold steel. My third is an arbalest, and also in arrows. My fourth is in power, plunged through a shield. My fifth is in honor, and also in vows. My last will put an end to it all.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?