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Can someone explain to me what it means in the elven magus favored class option "The magus gains 1/6 of a new magus arcana"

I have a cleric in a game I am playing that cast Mass cure light wounds and healed 49 points a dmg at 10th lvl. i am new to Pathfinder but I have 16+ years of gameing exp. Is this possible in anyway? i have looked through books feats archtypes ect. but cant find how this is done. any advise would be great