Sending bad bugs is probably the most comprehensive function of all summoned animals. Whether it is attack, defense (insects are divided into two places), medical treatment (detoxification) or assistance (reconnaissance), it can be said to be a unique all-round call, and because of its small size, it is not easy to be detected, and it can inadvertently reverse the battlefield situation. In the first film, Zhinai's limited appearance was only two battles, and the final key turning point was realized by worms suppressing the enemy's advantage without the enemy's knowledge. Therefore, using bugs well is not a simple matter. Omnipotence means complexity. It is very complicated to use bugs flexibly according to the battlefield situation. Because there are few opportunities to display Chennai, there must be a lot of room for the functional development of insects. As a secret skill of insect control family, the significance lies in keeping the secret of insect ability strictly. In the battle where intelligence decides the direction of the war, how to make the enemy not know the effect of his worm is what Chi Nai often says as the "last card".