20 January 2016 at 11:05pm
To add to what Alziel wrote, you couldn't do Cleave and Deep Wound together because they're both Combat abilities, and you can only use one of those per round (same with Speed abilities). So, if you win a round and are about to roll a damage score, you can't use Deep Wound to roll two dice to add to your Brawn/Magic, and in the same round, use Piercing to have you damage score ignore your opponent's armour. Pick one, and save the other for another round you win.
Modifiers are different, you can use as many of them as you want, at any time they apply. So if you had Dominate, which turns one of the dice you roll for damage to a 6, you could use it with First Strike or Cleave, to change the damage die you rolled to a 6. Or you win a round, roll a low number for damage score, then use Dominate to change that to a 6. And hey, in the same round (heck, even the same instant), you can use a modifier ability like Heal, to heal yourself. In fact, Heal's the rare ability that can be used multiple times per combat, if you have multiple items with Heal. Got three different items with Heal plus one with Dominate? Change any die you rolled for damage to 6, and heal yourself for 12 Health as well