A Troll has a particularly unpleasant alternative method of attack which is to vomit the contents of its stomach over its enemy. As a Troll's digestive juices are extremely corrosive this is a horrible thing to happen. The Troll's vomit is sticky and semi-liquid, so it penetrates armour easily and even dissolves part of it away.
Instead of attacking normally, the whole unit can choose to vomit on the enemy. Each model inflicts one automatic Strength 5 hit which.