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11. The Skeleton Lords: These goofballs aren't so hard to take down once you know what to do. They're quite intimidating at first due to this being a one on three battle. However, they're not that hard to take down individually. The real trouble here is that each one explodes into a mob of skeleton minions, so, if you're not careful and methodical about dispatching the minions before you move on to the next Lord, you could be easily overwhelmed. A summon here can help distract and cut down the minions if you're having trouble.
Summon? Maybe. Give it a go on your own and see if moving around the arena in a circular pattern for most of the fight helps. If not, summon away.
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12. Smelter Demon: Smelter Demon is a tank. He hits hard and he takes little damage. Your best bet here is to have some poison gear on you and a summon ready to go. Summon either the NPC or another player and attack him with your poisoned weapons. If you summoned the NPC, you won't have long as Smelter usually kills her in under two minutes, so work fast.
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13. The Lost Sinner: The Lost Sinner is a battle that depends entirely upon your ability to learn patterns and know instinctively when to block or dodge an attack. I guess another way to say this is that The Lost Sinner, like Gwyn, functions as a microcosm of Dark Souls. Screwing up once here is enough to get you gutted so learn Sinner's attacks even if it costs you a few lives. If you've got a decent shield, this fight probably won't be so bad. If you don't, dodge dodge dodge. For sorcerers, you need to summon another player/NPC and take down Sinner while she's attacking them. If you don't, well, good luck.
Summon? Only if you're a sorcerer.
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14. Two Dragonriders: Later on you get the chance to fight two of those Dragonriders at the same time (yay). What you need to do is bait the first one over to where the second is standing shooting arrows at you and let the first rider take out the second one's perch, sending the bow & arrow Dragonrider to the floor. Use long distance weapons, like arrows and bombs, to take him out and then take on the shield & spear rider on your own. Dodgeroll a lot and you'll be fine.
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15. Duke's Dear Freja: This fight is pretty self-explanatory. Giant spider with tiny minions that attack you. Kill some of the minions and then dodge the Spider's stomp attacks and laser beams before running over to one of its two faces—one on each side of its body—and attacking them. Avoid the minion spiders and you'll be fine.
Summon? Only if you need help killing the minion spiders.
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16. Royal Rat Authority: This fight is annoying because, like the other rat battle, you can't summon. First priority is to take out the Royal Rat's minions that surge at you at the battle's beginning as quickly as you can. If you've got some powerful arrows, now is the time to use them. As for the big rat-dog-thing itself, what you need to do is try and stay under or behind the beast at all times. HOWEVER, be on the lookout for if the monster starts to throw up; if that vomit hits you, it breaks your gear.
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17. Executioner's Chariot: This is a bit of a gimmicky fight. You start in a long hallway filled with alcoves. Every now and then the Chariot will rush down the hallway, so run down it and hide in the various alcoves. What you want to do first is take out the skeletons that are being conjured up and kill the summoners (there are two of them) that will resurrect them. Once they're all dead, there's a lever at the end of the hallway you need to pull, which brings down a grate that will kill the chariot but also start the second phase of the fight. Here, you need to be fast as the two horses hit hard. Don't bother shielding, just roll around, dodge their attacks, and then slash at their sides until they're dead.
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18. Scorpioness Najka: Najka can be a pretty big, poisonous pain if you don't bait her. The best thing you can do in this fight in unequip all your heavy armor—if you get poisoned, it's not going to help you anyway—and focus on staying in front of Najka the entire time. Don't be too far away. What happens is that she gets locked into a pattern where she (1) lunges at you with a sword and (2) attacks you with her two poisonous tails. If you can dodge both of these (it's surprisingly easy), then there's a huge window for you to attack her and then get away again before the pattern restarts. You can technically cut off her tails, but I'd recommend only doing that to one of them, so that she doesn't leave the pattern.
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19. Demon of Song: Ewwwwww. The winner of the grossest boss in Souls has to be this guy. He's a creepy face with two giant arms hiding inside froglike, invincible armor. The only way to damage him is to attack his face when it emerges from the shell, so what you want to do is stay in front of him to bait him out. Dodge his hand attacks and then slap those hands with your weapons. Rinse, repeat. Don't get too far away from him or he'll do a hop attack that's hard to dodge.
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20. The Old Iron King: As big and scary looking as this guy is, he's actually not that hard to beat if you're careful. There's an obvious corner you can hide around when he starts to do his flamespewing attacks. Hide there until his attack is over, run in and slash his arms a bit, run back. Don't stay behind the corner for too long or he'll submerge beneath the lava to attack you (this is the tricky part). Just hide, attack, hide again and this fight will be over quickly.