Add Difficulties (2 types)

* This content requires the full version, which is sold separately. If the latest patch is required, please update it before use. This is a free DLC that adds two new difficulty levels to the game. This content includes the following content, which will be reflected after receiving it from the "DLC Item List" in the game. ・Artifacts 　"Unknown" Difficulty Level added 　"Unknown" will be added to the difficulty level. Difficulty level can be changed in configuration. 　"Very Easy" Difficulty Level added 　"Very Easy" will be added to the difficulty level. Difficulty level can be changed in configuration.