
Passive
Mana Surge
Xerath's basic attacks periodically restore Mana. Whenever Xerath kills a unit, this cooldown is reduced.

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Riot Data Dragon 16.20.1. Base values before items, runes and bonuses; independent of match-data filters.
Base-game reference only. Mode-specific balance changes and augments are not included.
Official short descriptions · Data Dragon 16.20.1
Base-game reference only. Item, rune and mode-specific adjustments are not included.
This reference covers the passive and four ability slots. Alternate forms and full damage calculations are not covered.

Passive
Xerath's basic attacks periodically restore Mana. Whenever Xerath kills a unit, this cooldown is reduced.

Q
Fires a long-range beam of energy, dealing magic damage to all targets hit.
Base values from ability rank 1 upward.

W
Calls down a barrage of arcane energy, slowing and dealing magic damage to all enemies in an area. Targets in the middle receive additional damage and a stronger slow.
Base values from ability rank 1 upward.

E
Deals magic damage to an enemy and stuns them.
Base values from ability rank 1 upward.

R
Xerath immobilizes himself and gains numerous long-range barrages.
Base values from ability rank 1 upward.