Please be as specific as possible when letting us know what is missing or incorrect. For example, say "this game's trophy difficulty should be 8/10", with a link to a website corroborating this difficulty estimate (if possible), not "this game's trophy difficulty is wrong".
This is 'The Witch and the Hundred Knight 2' DLC 'Witch's Secret Skill [Item Drop Rate UP] x3'. By purchasing it, you will be able to use the secret witch's skill that has the power to 'increase Item Drop Rates' 3 times.