The Emerald Host

After armies have been set up but before the first battle round begins, you can pick up to D3+1 different enemy units on the battlefield. At the end of each battle round, roll a dice for each unit you picked that is on the battlefield. On a 2+, that unit suffers D3 mortal wounds. If that unit is a MONSTER, it suffers D3+1 mortal wounds instead of D3.