After opening ten gene locks, Han Sen wanted to take down Cup Demon Shelter, but Lotus Empress needed his help before he could do that.
She told Han Sen what she wanted to do.
For an ordinary king spirit, nine open gene locks was the max they could achieve. Obtaining ten was a supremely rare thing. For an emperor, opening ten was only the beginning. Once the figure of ten had been achieved, they had to work on what was necessary for them to climb The Ten Steps of the Holy Door.
Walking the ten steps was a great gamble, and beings that braved the door had to be certain they were strong enough to survive. If they couldn't withstand the purifying flames of the stairs, they would die. Even beings like Xiang Yin were almost unable to complete the ascension process and endure the fire.
Lotus Empress was confident she had what it took to brave the steps.