So I use Dawnbreaker as my main weapon atm and I noticed something. I know the crystal or w/e on the hilt will glow but sometimes I've noticed the whole weapon will glow brightly, to the point where if I go to 3rd person it looks literally like I'm holding a lightsaber. Is this a bug or this caused by something?

Supposedly, undead proximity cause it.

The blade glows more brightly when undead are nearby

Hah! like Sting wiith orcs.