Board Thread:Shadow Fight 2 Discussion/@comment-189.169.117.123-20150305003129/@comment-25669516-20171021111737

First, defeat Lynx normally to proceed to Act II. Once you complete some fights there Sensei will appear and tell you about the Eclipse Mode. You can then go back to Act I and challenge Lynx for his weapon. Defeat him in Eclipse Mode to obtain his weapon.

Do note that his weapon will automatically scale to match the current level of your player so it is advisable to get it at higher levels.