Is there a novel about the female protagonist who knows how to form hand seals and set up arrays, and the male protagonist who knows how to use qinggong?

He only remembered a very profound sentence. Because the female protagonist had been making hand seals for a long time, her fingers were a little longer than ordinary people. There was also a paragraph where the female protagonist selected some soldiers and taught them some array formations. The location was a very large tree that was gloomy and cool. In the end, some people were bewitched by their hearts because they were not strong enough and cut each other down with the soldiers around them. Also, the heroine chose some children to teach them how to make handprints.