Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Modding General How i can modify or create new talent?

It's not possible. The closest you can get is taking an unimplemented talent that the engine still recognizes and scripting effects onto it. That's how this mod works:

In one of the recent comments on that page I outline the basics of how to get started doing that, if you're interested: https://steamcommunity.com/sharedfiles/filedetails/?id=1508979975