There are couple more things to consider with fighting undead enemy :
1) they are undead , 50% more attack underground battle and during night time
2) they have +1 moral fighting in cemetery
So if you run along tough undead enemy army, try to avoid it until daytime, or if it`s in underground part of island wait till you get stronger to beat them.
Expl : you fight enemy black knight+ghosts army at night in cemetery, and you have 2lvl holy anger. Ghosts have attack 31 (18 basic , +9night bonus, +3,6 moral bonus +1 moral from cemetery, +1 moral from knight dark commander talent) , and defense 6 (13 basic , +2,6 moral bonus , -10 holy anger skill). During daytime not in cemetery battle they will have 22 attack/ 0 defense. It looks like much math , but it`s all simple calculation. Have fun with this game
