Dragonslayer Armour
Maximum souls: 475,891
The route to the Dragonslayer Armour is extremely dangerous, especially the 2 dragons breathing fire near a small bridge in front of the shortcut gate. From the Dancer of the Boreal Valley bonfire, climb the ladder and sprint to the Lothric Castle bonfire. Light this bonfire if you want or continue dashing your way to the Dragon Barracks bonfire. Cast Hidden Body as necessary. Now comes the most dangerous part of the route: the 2 fire breathing dragons. Stand in front of the bridge at the foot of the 2 small flights of stairs. Cast Sacred Oath and Flash Sweat. Do not cast Deep Protection as this would cancel the buff from Flash Sweat. Equip the Flame Stoneplate Ring+2, any other rings to boost your damage absorption such as the Ring of Steel Protection+3, and equip an armour set having decent damage absorption. For some HP regeneration while you traverse the sea of fire, equip a Blessed infused Caestus+10 on the left hand and the Sun Princess Ring. If you want, also equip a Blessed infused +10 weapon on the right hand or buff a weapon with the Blessed Weapon miracle. Wait for your Stamina bar to fully regenerate. Now sprint across the bridge. As the dragons start breathing fire, be ready to roll. Wait for the fire wave to hit the ground and start rolling and rolling and rolling, heading to your right aiming for the entrance to the lever that opens the shortcut gate. Another strategy is to jump down the bridge and take a detour around the dragons. You should be safe from the fire when you're near the entrance. Heal up and continue sprinting towards the shortcut elevator in front of the boss arena. There's no need to open the shortcut gate. If you need to restock your (Ashen) Estus, send the elevator down, Homeward Bone to the last bonfire you rested at, teleport to the Dancer of the Boreal Valley bonfire, climb the ladder, and sprint to the elevator shortcut you just activated.
The Dragonslayer Armour is generally easy by itself, but is dangerous due to the aerial support from the Pilgrim Butterflies. During the second phase of the fight, the Pilgrim Butterflies would spam spaghetti meatball projectiles at you and would occasionally charge up and fire a powerful laser. Don't get greedy and start spamming R1. This boss is aggressive and can 1- or 2-shot you to death. Here are some strategies to fight the boss, assuming that you first cast Sacred Oath or use the weapon art of the Sunlight Straight Sword, and cast Deep Protection. For some HP regeneration during the fight, equip a Blessed infused Caestus+10 in the left hand and/or the Sun Princess Ring.
Equip an Irithyll Straight Sword+5, a Chaos infused Lothric Knight Sword+10, and (Poison) Throwing Knife. Cast Tears of Denial if you want. Use the Irithyll Straight Sword+5 to R1 the boss until frost is triggered, then switch to the Chaos infused Lothric Knight Sword+10 to R1 the boss. After frost is triggered, hitting the boss with a fire weapon would remove the boss' frost bar, thus allowing you to switch back to the Irithyll Straight Sword+5 to build up the frost bar again without having to wait for the bar to slowly decrease. A (Black) Firebomb also works; generally, any fire weapon. As you evade the boss' attacks, occasionally use a (Poison) Throwing Knife to chip down its HP metre, e.g. after rolling away from an attack. Equip the Thunder Stoneplate Ring+2 and consume a Yellow Bug Pellet to boost your lightning defense. The strategy is demonstrated in the next video.
Dragonslayer Armour NG+33 Irithyll Straight Sword, Dark Souls III
Equip the Sellsword Twinblades+10 in the right hand. In the left hand, equip a Blessed infused Caestus+10, Sunless Talisman+5, and Pyromancy Flame+10. Cast Sacred Oath and Deep Protection, buff the Twinblades with Carthus Flame Arc, in the left hand switch to the Caestus, and 2-hand the Twinblades. Equip these rings for extra damage output: Lloyd's Sword Ring, Fire Clutch Ring. It's important to keep your weight ratio below 30% for this fight. If possible, use the Old Wolf Curved Sword in place of the Caestus or cast Carthus Beacon. Get in 1 or 2 L1 at a time, only performing a 3rd L1 if the boss is stunned or the right opportunity arises.
- This strategy is similar to the previous one. Equip the Sellsword Twinblades+10 in the right hand. In the left hand, equip the Old Wolf Curved Sword and the Sunless Talisman+5. Cast Sacred Oath and Deep Protection, buff the Twinblades with Lightning Blade, in the left hand switch to the Old Wolf Curved Sword, cast Carthus Beacon, and 2-hand the Twinblades. Equip Havel's Ring+3 to maintain a weight ratio below 30%, Pontiff's Right Eye so as to stack damage output with the Old Wolf Curved Sword, Ring of Steel Protection+3 for tanking projectiles from the Pilgrim Butterflies, and Chloranthy Ring+3 for extra Stamina regeneration. Get in 1 or 2 L1 at a time, only performing a 3rd L1 if the boss is stunned or the right opportunity arises.
- Attune Chaos Bed Vestiges and equip these rings to boost your pyromancy: Witch's Ring, Great Swamp Ring, Lloyd's Sword Ring. The fourth ring slot is up to you to decide. Cast Tears of Denial if you want. Be at a decent distance away from the boss and throw a Vestiges at its face.
- Attune Crystal Soul Spear and equip these items to boost your sorcery: a Scholar's Candlestick in the left hand, a Court Sorcerer's Staff+10 in the right hand, Crown of Dusk, Young Dragon Ring, Bellowing Dragoncrest Ring, and Magic Clutch Ring. The fourth ring slot is up to you to decide. Cast Carthus Beacon if you want extra damage output, but this pyromancy would cancel Tears of Denial. Two-hand the Court Sorcerer's Staff+10, buff the staff, and fire a Crystal Soul Spear once you're at a decent distance from the boss. The boss is highly resistant to magic, so Chaos Bed Vestiges should usually be preferred over magic.
- Use any of the above strategies and summon an NPC phantom to distract the boss. There are at most 2 NPC phantoms you can summon for this fight. Depending on how far you have progressed with the quest lines of Eygon and Sirris, you can summon one or both NPC phantoms to distract the boss while you sneak in a hit here and there.