Any Traitor Titan equipped with a weapon with the Ordnance or Rapid trait can be upgraded with a Corrosive Payload for a cost equal to a points cost of 5 x the weapon’s Dice value (e.g., a Warhound’s Vulcan mega-bolter would be +30 points), so long as that Titan does not already have an upgrade affecting that weapon. Each of the Titan’s weapons must be upgraded separately. Once per game, a weapon with this upgrade can fire its Corrosive Payload. When it does so, add 1 to all Armour rolls for that attack.
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