Notes from author
An experimental build to be sure, but it can be a lot of fun. I coined the name after Oscar of Astora, venerating his armor and his faith. The build can also take advantage of non-occult weaponry, but at the cost of vitality and endurance. For some reason I never cared for being overly tanky - just avoid getting stunlocked by Zweihanders.
The Occult Claymore can be very effective against enemy players in PVP. The Dragonslayer Spear is more for gags, especially when hurling lightning spears from your talisman on top of the R2. I also recommend trying Sunlight Blade on a Uchigatana +15 :)
One last thing: if you're going to play this build as a Gravelord Servant, avoid getting flanked. Otherwise you'll have to swap out the Havel's ring for the Wolf and fatty roll like an arse.