Xerath Ability (LoL): Arcanopulse

First cast: Xerath starts charging, gradually increasing the range of Arcanopulse up to a maximum of 1400 while decreasing his movement speed by up to 50% over the next 1.5 seconds. While charging, Xerath cannot attack or use his other abilities. After 3 seconds, Arcanopulse cancels and half the mana cost is refunded.

Second cast: After a brief cast time, Xerath fires a beam of energy in a line the deals 80 / 120 / 160 / 200 / 240 (+75% AP) magic damage to all enemies hit.