The moment you take the boat out onto the lake, you'll be attacked by the monstrous Del Lago. This is a unique boss fight that takes place entirely on the water. Leon is tethered to the boat and cannot leave it. Your objective is to throw harpoons at Del Lago until it's defeated.
- Strategy: Del Lago will swim around the boat, occasionally surfacing to attack. When it surfaces, aim your harpoons at its mouth or body. It will often try to drag the boat, requiring you to steer away from obstacles (logs, debris) by moving the left stick. If Leon is pulled into the water, rapidly mash the indicated button to escape. Del Lago will also dive and resurface, creating large waves that can capsize the boat if you're not careful. Anticipate its movements and keep a steady stream of harpoons hitting it. There are unlimited harpoons during this fight, so don't hold back.
- Weakness: Its mouth when open, and its body when exposed.
- Reward: After defeating Del Lago, you'll receive a Lure treasure and the path across the lake will be clear.