In Chapter 3.5 of Hunted: The Demon’s Forge, you’ll start off where you left off in Chapter 3.4, the rest area. Go along through the area into a corridor.
At the end of this corridor, you’ll find a corpse and the twenty-sixth Death Stone. Continue along, until you come across another door of which you should go through, and continue even further to come across a gate. Go through here and go along the path until you find a corpse containing the twenty-seventh Death Stone. From here, there will be tall grass to your left which you should cut through. Once this is done, you’ll come across the final corpse of a Death Stone for Chapter 3.5 of this game. Just continue a bit further where you’ll face a horde of enemies to fight. It is a bit difficult, but all you need to do is defeat them.
From here, you have completed Chapter 3.5 of Hunted: The Demon’s Forge.