Hello, Heroes of Bermesiah! We have found an error in the reinforcement rank rate for 17→18, which was added to the update on August 16th. The error is fixed as of now. Although we conducted a testing process for the Reinforcement Scrolls, we missed an error in the notes. We recognized the error in the rate table later and have fixed it straightaway. We apologize for the confusion caused by all this. After we have found an error, we have ran a more detailed run where we ran much more trials to reduce the error value. And we re-checked the trials to ensure that we can conclude with certainty. We apologize again for the inconvenience towards the players who enjoy GrandChase Classic. We will work harder to create a better GrandChase Classic for everyone to enjoy. We will strive to create the best experience possible. Thank you.