For the githyanki character question you posed. It is probably the glove equipped on that character. There are some gloves that cause "Bane" I think. The tooltip says it will also cause "Bane" to the wearer of the gloves if they are not marked by the Annointed or something like that. Essentially the gloves are kind of cursed. You will need to find out how to get the mark they need to not also "Bane" yourself or the character using them when they fight.