Actually, Ash could choose to leave the legacy directly.
The Ghost Key was on him.
But even if he left the legacy this time, he would still encounter the same challenge next time. Ash speculated that the reason he could retain his memory was likely because he used the Technique Spirit to reinforce his soul, allowing him to barely resist the effects of Return to Childhood.
Return to Childhood was silent and subtle, and the shared coat sleep might not work again. Moreover, this challenge required them to draw independently, so the three Sword Maidens had to be in a clear state; they couldn't always remain in the shared coat sleep state.
In other words, if they wanted all four of them to retain their memories and pass the challenge, they would have to devise a new soul miracle. It might only take a few days, but it might also take several weeks.
However, the problem was that level 35 wasn't the final stage. Based on speculation, the Ghost Legacy probably had 100 stages!
