Blast rain of thrathus projectile speed cant be changed

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Using Blast Rain plays it's attack animation, which includes drawing an arrow. This animation takes the attack time of the skill to complete. At the point in that animation where the arrow is realeased (which may differ slightly between classes), the skill "goes off" and starts waiting for the explosions to fall. There's a 600ms delay before the first explosions falls (which is affected by modifiers to both attack speed and projectile speed), and the falling animation takes 270ms (cannot be modified).