I've read over the mythaling notes but am unclear on one aspect. I understand the powers and how many can be applied on each particular item, but what if there is a bonus feat attached to an item already?

Will mythalling say, 3 powers onto a cloak, remove the bonus feat that is already attached? Or how much is the bonus feat worth power wise; even though you can't mythal it on yourself?

Bonus feats are 1 power.

If you try to mythal something that has 3 powers already, it just won't let you. You won't lose any abilities on your cloak and you won't waste the mythal for something that's over the power limit.

Thanks for the clarification!