My queen suggested I go with undead cleric this age as an active attacker. It should seem common sense that the perks (-50% Own casualties when attacking) + (-50% Own casualties when attacking) from the combo would mean than offence doesn't die, since undead lost that perk. However common sense says that this isn't actually the case. From these forums I have learned that the effects multiply not add? Just need some clarification on the result, it seems cleric to be such a waste if it falls short of anything but -100% casualties.