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Rule of Paths
A mage may never spend more gems in one turn than his current level in the relevant path.
Rule of One
A mage can use exactly one gem to boost the corresponding path one level.
Rule of Stash
A mage can only use gems from their own inventory.
Rule of Blood
A mage can use any friendly blood slave within 8 squares.
Current level is the mage's basic path level + path boosts from items, path boosting spells and being in a communion