- Basic horizontal swings, up to 4 hits in a combo.
- Two handed swing, has a long windup. Don't try to block it, move away from him when you see him wielding his blades together.
- Jump attack, telegraphed by standing still and crouching a bit. Will cause knock down, high damage and break through shields. Often uses it when you climb the stairs.
You fight this boss in a very small room, and there are two Undead Attack Dogs in there as well. Getting rid of the Attack Dogs is your first priority, as you will get combo'd to death otherwise. If you run up the stairs in the back of the room and get on the archway you should be able to kill the dogs up there. Be careful, however, as the Capra Demon can still reach you up there, albeit it sometimes takes a bit to get up the stairs.
After you kill the dogs, you can also use the jumping slash from up on the archway against the Demon to deal a fair amount of damage. It's not nearly as effective as it was against the previous boss, however.
The first 10 seconds of the battle generally will determine the outcome of this fight, since once you eliminate the Attack Dogs the boss becomes easier to handle. A shield can absorb the majority of the damage from the demon's standard swings. If you happen to notice it using a two handed overhead swing, do not try and block it, as it will almost always prove fatal.
The Capra Demon's path is fairly straightforward due to the small size of the room, leaving his movement very linear. At the start of the fight run for the stairs, the Demon's will try to jump attack you when it gets to the stairs making him fall below you. Alternatively, you can bait out the jump attack without running for the stairs by running towards the Demon immediately, and then moving backwards. This gives ample amount of time to start clearing out the dogs and making your way to the stairs.
Melee need to use a shield and be able to dodge the Demon. Circling is key, so you can more easily avoid his attacks. Counter attacking is recommended after it does two handed swings, as it recovers much more quickly from one-handed swings and will usually retaliate against anything you do.
(I find that you can get a counterattack anytime he attacks using his left hand.)
The Capra Demon has two movement animations: one where it walks around slowly, and another where it dashes. Keep an eye on the demon's current movement animation when attempting to flee up the stairs, because he may be hot on your tail without you realizing it.
In all honesty, the main issue when fighting this boss is your own camera. Combined with the tiny area and zoomed out view, most of the time while I fought with him I could hardly see a thing, just the foliage on the walls around us.
Apart from the attack dogs, the main issue with this boss is that most of the time he starts with a double handed strike when one enters through the fog gate. This attack is not blockable by low level characters and causes serious damage. In order to counter this, one has to immediatly dodge when one enters through the gate. Jumping to the right is not a good option, because one will get cornered by one attack dog and the Demon and most of the time he hits you anyway. The best way of dodging this initial attack is not to lock on after getting through the gate. Then walk towards the stairs and once he's in the air dogde straight forward. Normally he should miss you, because you'll end up right next to him. Then run straight up the stairs and kill the dogs.
With this tactic their is a risk that you'll get cornered between the second attack dog and the Demon after dodging its initial attack. But since the Demon needs a while to recover, it is possible to immediatly hit the dog and kill it. (note that I used a weapon which could kill the dogs with one blow)
Melee - Lure him up the stairs
A usefull tactic I applied against this boss was luring him up the stairs. Make sure he is almost at the foot of the stairs. Then when he starts walking up the stairs, walk up towards the end. When he's about half way jump off and walk past him, so when he jumps down you won't get cornered. After a few seconds he'll follow you and jumps off as well. He'll then needs so time to recover from the fall. While he's recovering it is possible to hit him two or three times without being hit back.
Applying some Charcoal Pine Resin to your weapon will make this go a bit faster because the Capra Demon is weak to fire. Throwing firebombs is also extremely effective. Wait for the Demon to slowly walk up the stairs (if he rushes you then jump off as normal), and heave a Firebomb or two while you wait for him. You could even forgo melee attacks and use firebombs exclusively to kill him by just throwing firebombs when he jumps off the stairs after you've successfully lured him.
Melee - Plunging Attack
Alternatively, you can utilize plunging attacks to kill him. After dispatching his dogs, you can freely run up the stairs and run across the ledge at the top of the stairs to the left. Capra Demon will either follow you up the stairs or attack aimlessly below the ledge. When climbing the stairs, he will rarely use his leaping ground slam which can reach you on the ledge. It can be blocked with any 100% physical block shield but hurts quite a bit unblocked. In either case, he will end up below you. Quickly use a plunging attack, roll away and run back up the stairs before the demon attacks you. As you are up on the ledge, it is also a "safe" place to kill his dogs. a spear is recommended so you dont hit the wall. they will jump and attack you, usually hitting you then falling off the ledge. If you see the Demon start walking away from you, this is a prime time to hit him with pyromancy, magic or firebombs if you have them. he will then proceed to run of the stairs where a few possible outcomes can occur. More often then not, we will run up half way, jump off and try to attack you. this attack is easily blocked. less frequently he will go all the way up the stairs and try to attack you face to face. almost every time he will take a step onto the archway your on and slide off back down below. Lastly, and although its rare, he can actually step onto the ledge without sliding off like he usually does. you can block all of his attacks, and hope he will slide off, or simply jump off the arch and he will follow, then run back up to the arch.
Melee - Hidden Body
Circumventing the dogs to reach the stairs being my biggest problem I tried to use Hidden Body before the fog. I was mildly surprised that it does not wear off as soon as you pass the fog. Being hidden did not prevent the demon from attacking me, but the dogs wouldn´t attack me right away. I was able to reach the stairs, kill the dog on the stairs and then the second one after that. Without the dogs, the demon was just a game of patience. Hidden Body greatly helped in the first 15 seconds of the battle. (Ring of Fog also works surprisingly well.)
Melee - Bleed
The Capra Demon is susceptible to bleed build up / damage; this was confirmed by using only an un-upgraded bandit's knife and looking for tear damage / listening for the bleed sound. A fast striking, upgraded bleed weapon such as the Bandit's Knife, Iaito Sword or Uchigatana along with a 100% block shield (Knight Shield for example) should make the fight easier.
Cheap method - Toxic damage
You can toxify the Capra Demon from outside of the fog gate by manually aiming Dung Pies (available from the Undead Merchant Female) and throwing them over the wall at the correct angle. Video demonstration: http://youtu.be/YVzKVrfCI_w?t=5m30s
Easy Ring of Fog
You can equip the ring of fog and the dogs will not go after you, allowing you to punish the Capra Demon undisturbed just don't roll into the middle of the room it will aggro the dogs. I found using sunlight very effective in killing him making him take about seven normal hits NG+.
Commentated/Foul Language: http://www.youtube.com/watch?v=56jCZNTEyoc#t=8m16s