World Tree civilization includes cities, guilds, merchants, schools, and professions (even prostitution).

Stress dice are open-ended and are re-rolled each time the roll equals the die's maximum value.

Certain species are more inclined towards character-class-like niches, although the ultimate choice still remains in the hands of the player.

Characters in World Tree have ten attributes, that technically have no upper limit, but generally range from -6 to +6, with a score of 0 being average.

The attributes are: There are Nine skill categories in World Tree: Magic, Verbs, Nouns (Verbs and Nouns are collectively called the Arts), Fighting, Athletics, Rogue Arts, Social, Crafts, and Knowledges.

Basic Combat uses a die roll comparison system, with ties being broken in the defender's favor.

Brawling consists of a set of combat maneuvers used to represent a rudimentary World Tree Martial Art.

World Tree: a role playing game of species and civilization (Padwolf Publishing, 2000).