World Tree is an anthropomorphic fantasy role-playing game designed by Bard Bloom and Victoria Borah Bloom and published by Padwolf Publishing in 2001.  The setting is the World Tree, a gigantic - possibly infinite - tree, with multiple trunks, branches tens of miles thick, and thousands long. World Tree was nominated for Best Anthropomorphic Game and Best Anthropomorphic Published Illustration in the 2001 Ursa Major Awards.
 Although combat plays a part in the game, most campaigns benefit from good role-playing skills on the part of the players. Almost all characters can make creative use of spontaneous magic, where characters can invent their own spell from lists of verb-noun combinations.
 The World Tree is described as a translation of the world's language, from the perspective of a visitor from terrestrial reality (Earth). World Tree civilization includes cities, guilds, merchants, schools, and professions (even prostitution). The civilization differs from human civilization in its lack of metals and magic everywhere.
 World Tree is a skill-based system, which uses custom d20 based system as well as playing cards.
 Dice are divided into two types in World Tree, with two corresponding notations - simple dice, which are noted as dN (with N being the number of sides), stress dice (noted as sN), and botch dice. Most of the time, normal dice will be rolled, but when a situation arises where it is possible to succeed or fail spectacularly, stress dice and botch dice take the place of the normal dice.
 Stress dice are open-ended and are re-rolled each time the roll equals the die's maximum value.  A natural 1 on the first stress die roll indicates a possible botch, requiring a botch roll to confirm the botch. Botch dice are d6s; only a roll of 1 indicates a botch.
 Each prime species has a template that initially defines the species' skills from childhood and starting attributes as well as their advantages and disadvantages.  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.  Some skills within some of the categories could reasonably fit into other categories.
 Magic covers specific applications of magic, many of which are discussed in the Magic section below.  The most obvious game effects covered in this category are:
 Verbs cover the "action" parts of a spell, what the spell "does".  There are 7 Verbs:
 Nouns are the elements that are acted upon, that is, what the Verbs are done to.  There are 12 of them, and they are the building blocks of the World Tree.  Some Nouns cover the classical elements (Air, Earth, Fire, and Water).  Others cover concepts: Illusion/Senses, Location, Magic, Mind, Spirit, and Time.  The remaining two are more specific: Animal Matter, and Plant.  Most Nouns are what they sound like.
 Fighting covers:
 There are several versions of magic in World Tree, which are all related:
 World Tree separates combat into Basic, Combat Options, and Brawling with the rules increasing in complexity in that order.  Combat is always assumed to be a stress situation.  Initiative is handled either with playing cards or d12s.
 Basic Combat uses a die roll comparison system, with ties being broken in the defender's favor.
 Combat Options are specific combat moves or fighting styles, and have both a basic and an expert version.  Being an expert at a defensive move gets you a bonus to attack against it, and vice versa, in addition to expert tricks to that move.  Other than the restriction that a character cannot use Attack and Defense options at the same time, the number of Combat Options a character can use at once is only limited by what the Game Master thinks makes sense.
 Brawling consists of a set of combat maneuvers used to represent a rudimentary World Tree Martial Art.  Each maneuver has both an attack and a defense equation, and most also have modifiers based on species or other factors.  Almost all of the equations include the Brawling skill.  This system is used mostly when you want to fight without killing.
 Bloom, B. and Bloom, V.B. World Tree: a role playing game of species and civilization (Padwolf Publishing, 2000).