The rules system for Heavy Feathers is a variant on the Amber DRPG rules, with lots of influence from Epoch's games, New Mutiny and Many Paths.  Each character has 3 Attributes (Physique, Warfare, and Temple) and a selection of Powers (Trump, Shapeshifting, and/or Sorcery).  Attributes are a closed scale from 0 to 10.  Powers are organized into trees, with certain ones required before purchasing others.  Both Attributes and Powers are purchased with points; PCs will begin the game with 100 points, at least 80 of which must be spent publicly.  Elders are generally built on 130-140 points, with approximately 80% of those points posted on the Pantheon page.  Besides being used for advancement, points can also be spent for very temporary boosts.  Spending a point in this way will give you the equivalent of one Attribute level for a brief offensive action (a single attack, for example) or two Attribute levels for a defensive action.  Amberites of the Third Dynasty, including the PCs, will receive one point per session to be spent or saved as they see fit.