I've been toying with writing up my monster house rules in a MM format for at least my own use. This would be a portion of the Dryad write up. I thought I'd post it as inspiration. Even if you aren't using 3.X rules much less my house rules, the concepts here might be useful to you. Dryad...
I have to say Treeslaying would be serious business in my campaign world.
From the text: "Among dwarves and goblins, who prefer to build with stone than wood and whose woodcraft tends to be inferior, those that must cut wood live in dread of forests and enter them only as ones preparing to do battle. Their methods tend toward harvesting timber in large quantities and great speed, and departing again from the wood before great resistance can be made of their presence. Dwarves in particular prefer to leave the harvesting of timber to others and the obtaining of lumber via trade."