1, attack power: You can improve the attack power of Chunhu after using Chunhu's primary skill book. This is very helpful for killing rats quickly in battle.

2. Defense: In addition to attack power, Chunhu's primary skill book can also enhance Chunhu's defense power. This enables Chunhu to better protect other delicacies and reduce damage.

3. Agility: You can also use Chunhu's primary skill book to increase Chunhu's agility. This means that Chunhu can move and attack faster, thus participating in the battle more effectively.