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After clashing with the Asura King for a few moments, Yan Yu immediately found that this fellow's toughness and resistance to attack were extraordinary.
Ordinary Sword Control Technique attacks could only leave a shallow wound on his body, like a cut from nail clippers, unable to inflict any real damage.
The killing effect of Sword Control Slash was slightly better, but at most, it just made him bleed a little.
Yan Yu quickly determined that this "BOSS" was designed by The Secret Realm of Lígōng to be a powerful enemy that "must be tackled and worn down by multiple people." Its defense and health were ridiculously high.
The only weakness was at the position of the eyes; his left eye had been destroyed by a White Rainbow Piercing the Sun, proving that the defense there wasn't very strong.
If subsequent attacks could strike the same spot, they might be able to penetrate deeper and reach the brain.