Hey Third Crusader!
While I do not have this permanently applied, and didn't come about getting it in the same way, I am too getting this on my Character that has the "Gloves of Power" equipped (collected off the goblin boss before the druid outpost)
I've noticed it applies the bane on hit as the item says but also applies it to the user? nothing in the flavour text indicates this should be the case.
Possibly just buggy bane mechanic?
Cheers!
Ex