Weavesight

When you see a Channeler weave a spell you don't know, but want to learn, make an Arcana skill check.  You must beat a DC of 10+spell level in order to understand the weave and identify a threads of the Power it uses.  You may choose to use an Affinity Dice to assist this check, but you must do so before the result is given to you.  If the spell does not contain your Affinity, the additional dice roll cannot be applied  and you still expend the Affinity Dice.