"Keen are the blades of shadow."[FRPG:67] Prerequisite: Swordmage Shadowy Action (11th level): When you spend an action point to take an extra action, you and all adjacent allies gain concealment until the start of your next turn. Shadow Defense (11th level): You gain resist necrotic equal to 5 + one-half your level. When you use any swordmage aegis power, this resist value increases by 10, and your melee basic attacks deal 5 extra necrotic damage. These benefits last until the end of your next turn.