How to brush qq flying ghost combat knives

Qq flying ghost combat knives brush method is as follows:

1, the ghost fighting knife can be used to kill insects with only a 5% chance.

2. Collect 12 star card exchange, the first floating S car. When shopping mall purchases "12 constellation treasure chest", open 100% and get a selected constellation card. Collect 12 star cards and exchange them for Ghost Fighting Knives. "