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Beat the chained ogre using this trick

1. When you go into the doorway there are two guards that you can eavesdrop. Crouch behind the right guard to do a stealth kill. Defeat the left guard in whatever way you like.

2. After killing the guards, get the ogre to escape his chains by getting his attention. No need to attack. Now quickly go behind the doorway again so he will lose your attention. He might still chase you but this forces the ogre go to a "respawn point", at the middle of the stairs instead of the now destroyed chains. It resets his attention to none on you.

3. Now grapple and travel out of the ogre's sight to the left side of the temple. Get on the left side of the shingled roof. Now you will see the ogre is standing in the middle of the stairs with his back turned to you. At this point, you can crouchwalk and stealth kill the ogre. He will still have one life left.

4. Now, you CANNOT repeat steps 2 and 3. because after you leave the doorway, it will reset the ogre's life to 2 health points again. Instead, go back to the left side of the temple that is next to the hill. Double jump on the center temple wall and hang of the edge of the shingles. Shimmy all the way to the left to lure the ogre to get as close to you as possible. Don't worry, the ogre doesn't have a mechanic to hit you while you edge hang.

5. Once the ogre is lured into the space between the hill and the wall of the temple, climb on top of the shingles. Now toggle camera-focus on the ogre. You will be looking down on the ogre while he is stuck. Now, hack and slash- don't stop!. Note that only the 6th or 7th slash will aim downwards and register. Keep spam slashing while camera-focus is on the ogre. Now he will die, and you will be left unscathed.