Undead are just undead, and Du You now understood that as well. This was the reason why undead creatures from the Undead Territory were so cheap and abundant; it was definitely not because the Earth Consciousness disliked the Undead.
Evidently, from this battle, Du You could see that the strength of undead creatures wasn't really that great.
Although, when tested individually, they didn't seem particularly weak in any aspect, their deficiencies were exposed in actual combat. The strength of the undead was too stable, and their ability to think on their feet was not very flexible.
Other races often burst into strength during combat, displaying much more power than what was evidenced in controlled experiments. The more perilous the situation, the more they could surpass their limits, whereas undead creatures clearly couldn't.