When the Character battle step starts, you may put 2 damage counters on one of your opponent's Ground or Character units with Stealth.
Pay 0 Force Prevent 2 damage to one of your Jedi Characters.
Keywords
Stealth
Stealth: An isolated, static ability that means, "This unit can't be attacked unless it's tapped or has damage counters on it." An untapped and undamaged unit with Stealth can still be affected by alternative types of damage. (Such as Overkill.) As long as the unit has any number of damage counters on it, it can't use Stealth.