The Adventure Zone’s Flaming Poisoning Raging Sword of Doom is a weapon open to interpretation, and Tumblr user Jesse put their own spin on it. They added just a touch of electronics by incorporating a string of LED lights into the sword’s hilt. These particular lights were all they had on hand, but you could get a similar effect with fewer, brighter LEDs. Whatever sort of lighting you go with, you can wrap the hilt and hide the battery pack in it. You can see a photo of that below.
Get additional details on the making of the sword from point to hilt at Tumblr.