Invoke True Name

Targets 1 creature whose true name you know.
You speak the true name of a creature to more
surely affect it with your magic. Until the end
of the current turn, the target is flat-footed
against your spells and takes a -2 circumstance
penalty to saving throws against your spells. In
addition, the first time this turn the target takes
damage from one of your spells, it has weakness
to that damage equal to double the level of
invoke true name.