Veil

At-will, swift, concentration; you are either invisible, or you appear as some other creature of the same size. This is a mental effect, so each onlooker is allowed a Wisdom check to see through the illusion. If you attack a creature, they automatically see through the illusion.

At Rank 2, you can manifest this effect in an emanation 1, increasing by 1 square per rank.

At Rank 3, the saving throw negates the illusion only for 1 round. Creatures are allowed a save every round.

At Rank 4, even when seeing through the illusion, onlookers see only a blur. They know where you are, but can't identify you, or easily predict your actions. They suffer disadvantage to attack you, and to dodge/parry/block checks against you.