New Content： 1.Add sound effect for Dragon Mother, Engineer and new core skills. Bug Fixed: 1. fixed the issue that the third modify introduction UI of building sometimes disappeared. 2. fixed the issue that core skill icons mismatch sometime. 3. Fixed the problem that sometimes the text does not match after switching languages. 4. Fixed an issue where the Arcane Mecha could not properly increase its stat value. Balance Adjustments: 1. Nerfed the health of the Recovering Shaman, Spike Dragon and Big Mouse Dragon. 2. Nerfed the number of monsters in the fifth wave, tenth wave, twelfth wave, and thirteenth wave in the fifth Map. 3. Engineer's 3rd Skill 1 Form and 3 Form have increased duration.