You may notice that knights have the same class as gremlins, in terms of weapons, which is swords, handguns (gremlins have flamethrowers instead) and bombs. But, you may also notice that there is one exception: knights don't have healers!
Well, I personally think that knights should have a weapon that heals other knights, or something like that. Maybe the weapon as certain weaknesses, like unable to attack enemies, long charge time etc. to balance out this benefit.
Gremlins have menders, and fiends have silkwings, so why not? :)
Now what do you think about this idea?