Classes define what your character can do in the game, determine their strengths and weaknesses, skills and abilities
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Which is part of the upgrade list in that article
After that point, it becomes a card draw engine that also does a great Hydra Omnivore impression in combat
Given the game's extensive rules and long history, this fanbase has built up a library of jargon and slang used to discuss the game in shorthand
I always felt that the Pixies deserved to have a less clunky version (a straight protection from artifacts rather than the hodgepodge of templates that existed back then