I translated this question; so I don't know if an answer in English will help much? Let alone get much engagement from the community here.

However, if you're one short on the Web of Corruption event, that's how it goes sometimes. While some champs are a guarantee event, others require you to spend massive amounts of resources to get (sometimes without even dropping the champ you want). I have played the game for years and there have been champs I missed during an event despit me dropping over 100 void shards without getting the champ I wanted. It really sucks but that's why this is a gatch game. They want you pumping in hundreds in cash trying to chase down the purple dragon my friend.