Aside from the skeleton that I just summoned, I also tested the other available skills, especially the [Corpse Bomb]. Of course, I didn't use the skeleton I just summoned and fought earlier as it would be a big waste for me to use that little guy as fodder for an explosion. So to test it out, I summoned another undead and this time, the one that was summoned was a zombie. Unlike the skeleton, it didn't have the same qualities as the skeleton nor do it have the comparative ability to wield weapons and fight effectively like the skeleton from earlier.
So instead, I used the zombie as the ammunition for [Corpse Bomb]. Compared to my expectation, the [Corpse Bomb] is not that strong in explosive radius and destructive capabilities. Perhaps the reason why the explosion is not that strong is just that I only used one single undead and since it has the option to use multiple, perhaps the explosion will amplify if I use multiple undead in one explosion.