Claire's portion of Episode four should not be too hard to complete in Invisible mode. Use the following steps with Barry. Take your time and find resources and ammunition as you progress. Focus on finding flame bottles and AR rounds. Using Natalia is very helpful. Have Barry wait while she runs ahead to complete objectives or reduce the number and strength of enemies that need to be defeated. This is very useful during the first Dhurlga battle, where you open the electric door. Have Barry wait by the exit, and send Natalia to the switch, then go back down and escape without wasting Barry's ammo or health. This can be repeated throughout the mines. Break the glass containers with Revenants individually so you do not have to fight them all later. Before triggering the elevator, search for supplies and kill all the Revenants. These Revenants are weaker than standard variety, and can be taken down with four pistol shots. During the second Dhurlga battle, use the explosive barrel by the elevator on him, then hit him with a few explosive or flame bottles. Finish him off with the rifle or magnum. He can be difficult to defeat, especially if you have not eliminated the other enemies yet. Use flames to destroy his tentacles and give you clear shots. During the final Boss battle, repeatedly use explosives and try to find extra ammo. When you knock her down, run up and shoot full AK clips into her. Note: If you choose the dark ending in Claire's Episode three, you will not have to do the fight on the mountainside.