When is the opportunity to make a westward journey?

There is a great chance to make a big trip to the West at night. Stars open three times a day, with six stars at random each time, each level 1, each weekend 18, and each difficulty level with three stars. You can only kill three times a week. You can only kill with a plow order. In addition to gaining experience, killing Skywalker also has the opportunity to gain the soul of the star, and you can change some props in Baoxiang country.