There is an 0.2 second casting time that must be completed in order for the impact to deal damage.
Cast times cannot be interrupted by crowd control effects, and will only be interrupted by Xerath's death. If Xerath dies during the 0.2 seconds, the impact will fizzle after the 0.5 seconds (and will not deal damage).
During the cast time, Xerath will ignore crowd control effects but still suffers from them if the duration persists.
If Xerath is displaced by a knockback or pull effect during the cast time, Eye of Destruction will still go off at the target location even if he is no longer in range.
The outline of the area of effect will appear the moment Xerath begins casting, and deals damage after the 0.5 delay. After the 0.2 second casting time, there is no way to stop the blast.
Eye of Destruction grants sight over a large area on-cast, which persists for a short duration after the blast hits.
Active:Xerathroots himself to his current location for up to 10 seconds, gaining the ability to cast Arcane Barrage multiple times, but losing the ability to cast his other abilities.
Number of Barrages:
3 / 4 / 5
Arcane Barrage - Active:Xerath calls down a blast of arcane energy to the target area which strikes after 0.5-seconds delay, dealing magic damage to all enemies within. Each cast has a static cooldown of 0.8 seconds.
200 / 240 / 280 (+ 43% AP)
600 / 960 / 1400 (+ 129 / 172 / 215% AP)
Rite of the Arcane can be cancelled early by moving or attacking and automatically ends once Arcane Barrage has been cast enough times. If Rite of the Arcane ends without using a single cast of Arcane Barrage, half the cooldown is refunded. Rite of the Arcane is canceled and put on full cooldown if Xerath is affected by any crowd control that prevents or interrupts the casting of abilities.
Rite of the Arcane is self-targeted ability that roots Xerath in place.
Rite of the Arcane has a short activation time where Xerath ascends into his true form. During this time, Arcane Barrage cannot be activated and a circle indicating the ability's maximum range appears (starting small and rapidly expanding to the maximum range over the cast time).
The maximum-range indicator is visible to both allies and enemies.
Activating Rite of the Arcanedoes not automatically use the first cast of Arcane Barrage - you must activate the ability twice in order to first deal damage.
Arcane Barrage uses a barrage system so that it can be cast multiple times within a given period at no additional cost.
Arcane Barrage has a 0.8 second cooldown between casts, not affected by Cooldown Reduction.
Each cast of Arcane Barrage grants a brief area of sight.
Each cast is classified as an activation for the purposes of effects such as Tear and Spellblade