Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Modding Troubleshooting Newbie - Any documentation available? (For skills)

There's https://docs.larian.game/Skill_creation . It mentions that the root template of a projectile skill defines the arc (search for "arc" on the page). You can try copying the uuid of a template in the skill data, paste it in the root template browser, and see what properties are available in the sidebar.