The damage type that Xerath deals is mostly Magic Damage.
Xerath's damage type breakdowns as follows:
Xerath's basic attacks periodically restore 30 - 195 Mana (based on level) doubled against enemy champions.
First cast: Xerath charges Arcanopulse, gradually decreasing his Movement Speed while increasing the spell's range.Second cast: Xerath fires Arcanopulse, dealing 70/110/150/190/230 (+85% bonus Ability Power) magic damage to all enemies in a line.While charging Arcanopulse, Xerath cannot attack or cast other spells. If Xerath does not fire the spell, half the Mana cost is refunded.
Xerath calls down a blast of arcane energy, dealing 60/95/130/165/200 (+60% bonus Ability Power) magic damage to all enemies within the target area, slowing them by 25% for 2.5 seconds. Enemies in the center of the blast take 66.7% magic damage and are slowed by 60/65/70/75/80%. This slow decays rapidly.
Xerath fires an orb of raw magic. The first enemy hit takes 80/110/140/170/200 (+45% bonus Ability Power) magic damage and is stunned for between 0.75 and 2.25 seconds. The stun duration lengthens based on how far the orb travels.
Xerath ascends to his true form, becoming rooted in place and gaining 3/4/5 Arcane Barrages. This magic artillery deals 200/250/300 (+45% bonus Ability Power) magic damage to all enemies hit.The root ends after 10 seconds, when all shots have been fired or when manually deactivated by issuing a move command. If no barrages are fired, 50% of the cooldown is refunded.
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