In the dark cave... well, yes.
I and my dear fucking bad luck were walking towards our last target. The lich that was 'most probably' the last guard I would face before facing that fucker evil spirit.
"I know the lich would be tough, but what the hell, man... how can I not get an energy core when there's a certain chance of getting one after killing an undead knight and mage?! This is crazy!!"
[{ Master... I understand your anger, but it's not certain that you will get an energy core from undead creatures of high rank. It is just that there is a very high possibility because the undead's energy core is already active when they are functioning. As they already have the core when they are 'alive' after their 'death', the chances of the core remaining intact are the best.