The Living Failures in Bloodborne: The Old Hunters DLC is a collection of previously encountered enemies. Once completed, you acquire the Astral Clocktower Key as a reward.
Each enemy does not have crazy amount of HP, but you should constantly be killing enemies that spawn at a constant rate to avoid getting overwhelmed. The best idea to deal with them to stay behind them at all times, but if you are unable to do so; you need to make sure to deliver a few hits before dodging away.
At long range, one of the Living Failures will toss an orb in your direction which will explode upon impact. While this does not have a large explosion radius, you should consider having a safe distance in order to avoid receiving damage. In addition to this, another ranged attack comprises of multiple faster orbs coming towards you.
Despite their speed, it is quite easy to dodge these orbs, however, do note that if one of these orbs hit you, there are good chances that you will get hit by some more of these which will probably deal quite a great amount of damage.
In addition to this, the Living Failures will summon a meteor from the sky which always comes from the right-hand side of the sky. In order to avoid this, you need to stand on the left-hand side of the tree.
Another thing that you need to know here is that all the Living Failures do not attack while the meteor is being summoned. Therefore, you should head in and deliver a couple of strikes before retreating. All in all, you need to pay close attention to your surroundings and see that you are not flanked.
Keep this in mind and all of the things mentioned above and you should complete this boss battle in no time.
Lastly, do not forget to share your own tips and strategies with us in the comments section below!