The original report complained that gremlins seemed impervious to
Sunsword's light yet a flash from a camera caused them to cry out in pain
despite "The long sword named Sunsword begins to shine brilliantly!"
This commit does two things:
1. A dmg bonus is applied against gremlins using a lit Sunsword.
2. Gremlins will generally avoid the light emitted by Sunsword.
There's a few minor flavor bits thrown in also.
It is understood that this effectively makes Sunsword provide
"gremlin-proofing", but the gremlin myth and Sunsword's characteristic
feature pretty much demand it.