Immortal Monarch Bugui knew that Han Yi was very strong, extremely strong.
But he had not anticipated that Han Yi was strong to such an outrageous extent.
For the four of them, joining forces was the only way to avoid defeat, yet they still found themselves at a disadvantage against a powerful enemy who couldn't withstand a single move from Han Yi.
The Demon Soul had not been deployed before, showing that the demonic cultivator had not been fully exerting himself; had it been used earlier, the four of them would have had no choice but to flee in all directions, their survival left to fate.
With Immortal Monarch Bugui's insight, it was clear that a demonic cultivator who could summon a Demon Soul certainly possessed combat power close to that of a Peak Immortal Monarch.
Yet Han Yi, with a wave of his hand, destroyed it and effortlessly suppressed two weapons of Seventh-stage Immortal Device level, making it look as easy as if clouds were lightly clearing after the wind.