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Full: For 1...10...12 seconds, your arrows deal 1...7...8 more damage and spread Choking Gas to all adjacent foes on impact. Choking Gas interrupts foes attempting to cast spells.
Concise: (1...10...12 seconds.) +1...7...8 damage. Spreads Choking Gas to foes adjacent to target. Choking Gas interrupts spells.
Even if your attack misses or is blocked your target will still take the bonus damage and the AoE interruption will still occur.
The extra damage from Choking Gas is dealt in a separate packet which is applied before the arrow's damage, meaning that if you hit someone who is protected by the enchantment Reversal of Fortune, Reversal will reverse Choking's bonus damage and not the arrow damage.