Sker Ritual

Abraham is the main boss on Cursed Lands of Lavernock. You can “kill” him in the normal zombie rounds, but this will not pop the achievement. You need to finish all the story objectives on the map which will eventually lead to a “defeat Abraham” objective.

This was a pretty straight up fight compared to the other maps. The arena is a giant circle so just keep moving to bunch up the normal zombies behind you, and whittle down his health when you can. Defeating him ends the “story” objectives on the map and allows you to extract from the level.

This guide is a stand-in until I can write out a full text version but this video will tell you everything you need to know.

The video teaches you how to do the main story easter egg

As far as the weapons I used, I used the Assault rifle you find in the pack-a-punch or tier upgrade room and went for headshots. I had it upgraded to Tier 2 and I had the electric weapon from the one objective as my second weapon at Tier 1, which I didn't use at all. The only perk truly necessary for this fight is this game's health increase perk which is 2500 points and can be found in the area where you destroy the 4 power generatos.