Yeah the optional fights are murder. Fuck the Dark Covenant, seriously. Fuck it twice for requiring an Effigy for every attempt. Ancient Dragon is pretty much just getting close initially and then executing for 20 minutes straight without fucking up at all. Vendrick I am still hung up on, mosty because he seems to magically move me in front of him at random times and one punch crunch me. And I still have not beat the fucking Rat Authority, but my build makes that fight somewhat impossible. I can AE the adds instantly, but the "I am Sif with shitty telegraphs, constant stunlock, and the tiniest hitbox for a giant monster ever" does not work well with a Black Knight Halberd wielding caster.
For the Rat Authority, use one of the weapons that do a 360 swipe on the legs while underneath it. Will usually connect to all legs, or you can use Soul Vortex. That's what I did, took around 4 or 5 casts. Casting that while it is over you will cause it to jump backwards, then lunge forwards right into it again. As you have finished casting it as it jumps back just put up your shield, block, move back, regain stamina, enter leg area again, rinse repeat. With me he did the jump back, jump forwards every single time I cast it, so it became very easy to anticipate its movements. I didn't even have that good of a catalyst when I did it, but if you are late game, 1 cast of Soul Vortex should take around 20+% of his hp.
Playing as a sorcerer too, with 20 str, 26 dex. Been using a blacksteel katana, but found the Washing Pole yesterday and now I want to upgrade that. Certainly not the best weapon, but ... Sepiroth. Been using a dragonrider bow. Is there a greatbow somewhere though? Not found one yet, even though I have arrows for it.
For my catalyst I have a +10 black witch staff that can cast spells, hexes and miracles. I have 3 of them (apparently a rare drop?), and not sure if I need to upgrade another one. I upgraded it to +10 first (+220 on all stats) , then wanted to add dark damage to it, but at +10 it doesn't show up as upgradable with elements. The base black witch staffs can be upgraded. So maybe elements can only be added to +5 for those staffs.
Hardly ever get invaded, but when I do, it seems to be people who camp the elemental blacksmith. So very annoying. With all the PvP areas and such I can't help but think they have to be a total ass in real life to invade in that area. Do not think it would be "lol casual!" to have the bonfire area/zone next to a blacksmith as an area that can't be invaded.
Currently I have done every boss except the Dark Covenant, Ancient Dragon, Undead king guy and the final boss. Love the game, but getting burned out now. Not played anything else since I got this game. Doubt I will double dip for the PC version unless they release a DLC later on. Easily the best game I have played this year though. Considering the amount of content and time this game takes, it makes me wonder what other studios are doing with their time when 85%+ of other console games are usually 10ish hours at best with game areas 1/10th the size. Be easy to say quality over quantity, but when this game has both in spades it makes me wonder.
Really, really looking forwards to Dark Souls 3 on next gen consoles in a few years. Doubt they will have problems getting funding for another one.