Hide Behind Ally (Pixie)

When occupying the same space as a conscious ally that's at least a size bigger than you, you may choose to become untargetable to single target attacks. 

When targeted by a single target attack, you may direct the attack a willing ally with which you spare the space. They may react to this attack as normal. After you re-direct an attack like this once, you automatically redirect all other attacks you can until the start of your next turn

While occupying the same space as a conscious ally, any effect that triggers upon not being targeted by an enemy (such as Challenge) will not be triggered. Does not work against Attacks of Opportunity.