Active: Xerath anchors himself to his current location with a 0.5 second casting time. For up to 8 seconds afterwards, he gains 400 bonus range of all his spells and bonus magic penetration, but cannot move. Xerath can deactivate the ability at any time after 0.5 seconds of casting it, and gains 35% movement speed for 2 seconds when doing so.
Active: Xerath deals magic damage to an enemy and marks them with Unstable Magic for 3 seconds. Unstable Magic will trigger if a marked enemy is hit by one of Xerath's spells, stunning them for 1.5 seconds.
Active: Xerath calls down a blast of arcane energy, dealing magic damage to enemies in a target 200-radius area after a 0.5 second delay, and briefly providing sight within a 300-radius area. Arcane Barrage may be cast another two times, with no cost, within the next 12 seconds before going on cooldown.