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A Lower Skeleton Warrior didn't have any intelligence of its own. At least, not truly. Its strength existed in three facets.
The first was that it was incomparably sturdy. As though it was refined by the sturdiest metals and ores known to the cultivation world, it was incredibly difficult to even nick a Skeleton Warrior, let alone destroy it. And, this benefit only became more apparent as it evolved.
The second was that it was capable of self repair. A Lower Skeleton Warrior only needed time and qi to repair it, namely death qi. The more pure and powerful the death qi, the faster a Lower Skeleton Warrior could repair itself and thus the stronger it would be overall.
The third was the final point was the one Ryu harped on first.
A Skeleton Warrior was a blank slate, almost like other Corpse Puppets. However, it was far more convenient to use and almost worked like Hecate's puppets to a small degree.