Step 4 - After killing the Deacons of the Deep, head to Firelink Shrine to find Anri and Horace.Exhaust all dialogue options for both and receive the covenant item from Horace. Step 3 - Head to the Halfway Fortress bonfire and meet Anri of Astora and Horace the Hushed.Doing so will remove your hollowing and your Dark Sigils- which is a failure condition for the quest line.) It should also be noted: DO NOT give the Firekeeper's Soul from the top of the tower in Firelink Shrine to the Firekeeper at any point. You need to increase your hollowing by dying in order to gain levels in the form of Dark Sigils from Yoel. (This needs to be completed before killing the Abyss Watchers, otherwise Yoel will die and you will no longer be able to continue with the quest.) The purpose of killing yourself and and "drawing out your true strength" is to amass 5 Dark Sigils in your inventory. Afterwards, standing by his dead body will be Yuria of Londor, an important NPC with whom you should speak. Repeat this 5 more times, until Yoel is dead. Now kill yourself twice, then speak with Yoel again and have him draw out your strength. Step 2 - Go to Firelink and have Yoel draw out your true strength.
Step 1 - Find Yoel of Londor on the bridge that leads into the Undead Settlement.
Below you will find the steps in the order you should encounter them: The steps to unlocking this alternate ending are long and sometimes vague.