Where is the Spear of Braccus Rex in Divinity Original Sin II??

You can find the Spear of Braccus Rex in a cave southwest of Fort Joy. It will be located near "Buddy the Dog". In the cave near it there will be playing hide and seek. Talk to them, play their game, and if you are able to find the kid twice, he will show you a hidden hatch. If you climb down this hatch, you'll find the Spear of Braccus Rex.