Lyric discussion by theGrynch 

Cover art for World Ablaze lyrics by Killswitch Engage

I agree with charisma. It's about two people sharing a very deep connection, and knowing that they are there for one another, they can shoulder the burdens together.

Shed the weight of this world. The burden has been lifted., let it all fall. Set this world ablaze, we alone remain. Dont fear what awaits, we alone remain.

He's just reassuring her that they're there for one another, and they can handle it together, that they can shed the burden and let the weight off their shoulders. That even if the world burns, they will still be connected and helping one another through it.