The Golden Glow of Courage

A small brown bag appears in front of you. It's cenched with a golden thread and that thread is bound together with a knot, which is threaded into this golden glowing lock. You might want to keep it on your person at all times. The nature of this bag is that you would not be able to remove it until you most needed it. Kind of a Schrödinger's bag. And for all intents and purposes, it's basically a spear.