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Using the arc of death on some dark bishops

The Arc of Death is the third weapon used by the Mage from Hexen. It is a spell that summons a great bolt of electricity from floor to ceiling, which travels in a straight line away from the player. When the bolt strikes an enemy, it will follow them around inflicting damage for three seconds before it wears off, or until the target dies. This weapon uses Green Mana at a rate of five per shot. This weapon is very effective against the Centaurs as their shields are unable to block the bolt.

The Heresiarches' shields cannot deflect the Arc of Death either. It could be said that the Arc is the most effective third weapon.