I'd like to see the Ironwood spell put into the game for druids and rangers. In case you haven't played tabletop and are unable to sort out what ironwood does, it's simple, you take one wook weapon and make it as deadly and as durable as if it were iron, without increasing the weight.
There was also another spell like metal to wood of such that turned all metallic weapons into wood, with the exception of ironwood. Magical weapons are immune to this spell though, and for the sake of this game you might make the metal to wood spell effective on only one foes weapon, and for a short time.
Metal to wood was Druid only, but I think druids and rangers could create ironwood.