When you deploy Shel, you may choose one of your other units in any arena. If you do, the chosen unit gets the Old Republic Resistance subtype and Focus 1 until it is discarded.
Keywords
Focus
Focus X: A cumulative ability triggered by the initial dice roll that means, "When you roll at least one natural five with this unit's attack dice before re-roll, this unit gets +X power for its next attack." Only the first natural "5" counts. A five rolled after re-roll doesn't matter. Focus applies only to dice rolled for an attack, not to dice rolls for abilities like Retaliate. Accuracy can't increase the die roll to a natural "5."