He's surprisingly not too bad, though his second phase can be stressful if you let it. Most of his attacks are slow and he has pretty generous tells. When his second phase kicks in, I advise you to not use the lock on feature, control the camera manually, keep your distance, and take your hits when you can get them safely. This boss is about making you panic and act recklessly, but's he's actually pretty slow which makes him manageable. I advise challenging him at the portal at Drangleic Castle since there is a bonfire right next to the Old Man who heads the covenant.
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In Demon's Souls news, I had a very weird evening.
So I took on the Old Monk, and as I figured, a lot of people are taking advantage of knowing the servers will offocially be gone at the end of the month, so I had three different people invade me for this fight, though I only fought one of them cause those damn Black Phantom Mindflayers are a real bitch until I realized all of their moves are magic based and Anti-Magic Field is a slightly broken spell. The weird part of the evening is that not only did my opponent not put up much of a fight, but I think they actually gifted me a Pure Bladestone (It is the rarest Upgrade Material in the game, only obtained as a rare drop from a nasty enemy in the Shrine of Storms Area) cause one was just lying there in the boss room. So I kind of feel bad, cause I'm not sure if they purposely threw the fight or was simply hoping I could be bribed to throw the fight for them. Considering how non-aggressive they were, I think they just let me win. Still left a weird feeling, but I've heard of players in this game invading other players only to actually help them out. I may actually do that once I reach the last few levels.
Also, smurf the Valley of Defilement. Like seriously, it is the worst poison swamp area in the series. I haven't even reached the second level which is worse, but the first zone is being obnoxious. One thing that got changed in the later entries is the ability to attack enemies who are "playing dead" not in this game. The enemies in the first part pretend to be corpses and then ambush you once you've passed them. Also, the Large Variant has a crap ton of health, which I was expecting, and making me dread even more so, the next stage. Thew True Demon's Souls begins here indeed.