As for the Land of Corruption skill...
This was an additional skill that Necromancers in Lord World could learn.
Its original strength wasn't actually that high. It just turned an area into an undead zone similar to a "Death Zone," from which large numbers of Zero-star undead cannon fodder would continuously crawl out of the ground.
But when combined with a Necromancer from Middle-earth Warhammer, the skill's power level skyrocketed instantly.
This was because the ordinary Necromancer Profession in Lord World could at most summon Zero-star (purple) cannon fodder skeletons, whereas a Necromancer from Middle-earth Warhammer could summon Extraordinary Skeletons of the Extraordinary Realm.
In fact, it wasn't limited to just Extraordinary Skeletons. Those other Undead Creatures like "Vampires" and "Rootless Ghosts" might also be able to spawn from the Land of Corruption.
