An albino dragon without scales, granted the title of Duke by Lord Gwyn for his assistance in defeating the Everlasting Dragons and given a fragment of a Lord Soul. Seath was driven insane during his research on the Scales of Immortality, which he could never obtain. Ironically, he is now an immortal himself, a true Undead by means of his research into the Primordial Crystal, which he stole from the dragons when he defected.
His servants, the Channelers, assists him in his research by kidnapping women to be experimented upon. The Pisaca is the result of one of those experiments. He can also create life from scratch using sorcery, resulting in the Moonlight Butterflies.
This is where you properly fight him. The boss arena is at the end of the path, behind the area with the Man Eater Shells. Initially the boss arena will be open, but after you approach the Primordial Crystal, a cutscene will play and the boss fight commences. After the cutscene plays, the next time you fight him (after you died or teleported back to the bonfire), a normal boss fog will be there as he's already in the arena.
- Bequeathed Lord Soul Shard (Seath the Scaleless)
- Moonlight Greatsword - automatically added to your inventory after you cut his middle/back tail
- Although the item description of the Six Eyed Helm of the Channelers notes that Seath is blind, avoiding making noise using the Slumbering Dragoncrest Ring or casting Hush has no effect during the boss fight. However, this is because he attacks where you last attacked from.
- The dragon Seath and the Moonlight Sword are based from From Software's earlier King's Field series. Although the Moonlight Sword's special ability (exploding energy wave) may be based from Armored Core series' Moonlight laser sword's signature energy wave.
- During the first time you fight Seath, there's a rare bug where the boss fight doesn't start, and Seath just sits there doing nothing. He still regenerates health, however, but will not start a battle when you attack him. In order to fix this bug, just quit and reload. The bug can be found here: http://www.youtube.com/watch?v=_vcXwdJmUEc
- The "Seath doesn't attack" bug can be reproduced reliably, though it has no real use because he is still invincible. Encounter him once, normally. Play through the Archives until you reach the back bonfire. Rest there, return to Seath's room, start the "fight," then leave the room through the fog door you came in from. Run back to the rear bonfire, rest, and return to his room a third time. The third visit resulted in no healthbar appearing and Seath not attacking at all.
- Pauses and unleashes a breath attack on the position of the player at the instant of the pause. This breath attack carries the curse status effect and is unblockable because it comes from beneath the player.
- Pauses and unleashes a breath attack from (player) left to right (heavy damage on the left).
- Minor (side) tails lash.
- Primary tail lash that does more damage than his minor tails. This is the tail behind Seath, not visible from its front.
- Bends down and swipes with his left arm in front of him.
- "Nova"-style area-of-effect crystal wave attack centered on himself. This can be dodged easily by backing off a few paces. Deals heavy damage if the player is not fast enough to get out of range.
- When you encounter Seath for the first time in The Duke's Archives, he regenerates all damage dealt to him. Do not waste arrows or consumables on this fight.
- Equip Ring of Sacrifice with high curse resistance or equip a Rare Ring of Sacrifice if you want to keep your humanity and souls.
- If you entered the boss room without making proper preparation (as you're intended to die here), there are several places in there for you to be able to safely customize your equipment or quit your game (you'll spawn outside the fog gate after you load your game):
- Immediately in front of the fog, after you enter the boss room; provided you do not move, Seath does not initiate his attacks
- In the far upper left corner, at the bookshelves
- A slight gap just in front of Seath (you need to get really close). if you stand here, most of Seath's breath attacks will not hit you
In Crystal Cave
- The first time you encounter Seath in the Crystal Cave, there is no fog wall and the Man Eater Shells sometimes make their way into the fight if not killed, although Seath can kill these Man Eater Shells with crystal breath quite quickly. Stay near him and don't get hit for any mobs that got in the room.
- Equip curse-resistant equipments.
- If you don't mind going heavy, Havel's Set provides high resistance to both Magic and curse. If you have the Strength to wield it, Havel's Greatshield can help you block Seath's crystal breath. But, it is advisable to just go light and two-handing your weapon, as his crystal breath is easily avoided but you can get cursed easily if you get caught by it.
- The Primordial Crystal (the glowing crystal shard on the far side of the room) must be destroyed to keep Seath from regenerating his health. You can destroy it yourself, or let Seath destroys it himself with his crystal breath. On subsequent attempts to kill Seath, you need to run behind Seath at the beginning of the encounter to destroy the crystal.
- If you want to cut his tail for Moonlight Greatsword, when you start the fight, run to the crystal, but don't destroy it right away. Wait for Seath to approach and bait his breath attack. He will destroy the crystal himself. Once the crystal is destroyed, Seath pauses momentarily, which gives you time to run around him and attack the very tip of his middle/back tail. Seath's tail is about 15% of his total HP, so use a powerful weapon with a long attack. It's not about hitting certain amount of times.
- Attacking the tail on your right leaves you pretty much impossible for him to hit with his attacks. As long as you stick close to it, you can avoid his crystal breath attack and he will not use the tail slam. Useful if you don't want to cut off his middle tail for the Moonlight Greatsword.
- When Seath stops following you around (moving/turning to face you) he will attack. If you were at mid range, he will attack accordingly and breath in the mid range, use this to run in (or out if you were close to him) and deal damage. Works especially well if you aren't worried about cutting his tail.
If this is the first time you entered the area, simply backup up near the crystal and wait for him to approach and start his breath attack. If you're entering through the fog door, simply approach him until he starts his breath attack, and then run around him on your right to the crystal.
Throughout the fight it is ideal to keep Seath in the center of the room so that you do not become trapped. Don't lock on as you want to be able to see his head when he initiates breath attacks and to to easily run up to him and then back to the fog wall / behind the crystal.
If you're not going for the tail cut / already have it (if you are, see the bottom of this page), the most reliable way to get an opening to attack Seath is to wait at medium range until he lifts his head to start a horizontal breath attack, and then run up to his chest. The breath / crystals will just arc around you. Attack only a few times depending on the speed of the weapon / spell and then run back to a far wall, as he often casts his Nova crystal attack at this point. Repeat this and you shouldn't take any damage.
Note that you can avoid his Nova crystal attack without running away. When he is preparing a breath attack, position yourself in the corner between his chest and either of his foremost tails. In this exact location, you are immune to the Nova crystal.
Performed this while equipped with the Silver Knight Spear +5, Silver Knight Shield +5, the Maiden Set, Havel's Ring and the Grass Crest Shield. Recommend the Cloranthy Ring if possible, but if you're worried about curse then equip the Cursebite Ring instead.
When facing Seath after dying in the Crystal Caves, stand near the fog and lead him away from the crystal. When he is far enough away to make it past him, sprint to the other side and stand by the crystal. He will follow you back and use his crystal breath attack. When he begins to lean back, sprint past his left tail (to your right side, while facing him) and allow his breath to break the crystal. Use this opportunity to score some free hits, but when he stops roaring, run away. The idea here is to avoid ever taking a hit. Sprint back to the fog gate, and wait for him to come to you. When he gets close, but hasn't started attacking yet, run back to his left tail and stay near the end of it if he starts turning around, always circling counter-clockwise around him. If he turns too far and his left tail is too close to a wall, it's best to just bail out and run away, or else he could trap you. When he stops to do his breath attack, run behind his left tail. His attack shouldn't be able to reach you from here. It's safe to attack him once or twice but DO NOT keep attacking after his breath animation ends or he will start swiping the ground with his tails or do his AOE crystal attack. Running out of stamina here is a death sentence. Instead, run back to where the crystal used to be. Keep repeating this trick and hopefully he'll be dead in less than 15 minutes. You should not take a hit if you do this properly.
You can also sprint at the base of his leftmost tail. Seath will circle to face you, but if you are fast enough, you can deal a few blow to the tail. from this position, you are out of range of all but his Nova attack.
Even safer melee
(Medium weight and under)All you have to do is get close to his front and bait him into using a breath attack, then just run around to his left (your right) minor tail and start hacking away. In this position Seath will not be able to hit you at least 95% of the time. The only thing you'll need to worry about is chasing the tail around (just bait another breath attack).
Seath's attacks are short-ranged enough that you can stay out of range and retain lock-on with a bow. Bring a bow and approximately 100-200 arrows. Keep Seath in the middle of the area, lock on and circle around him, firing arrows as you go. Be sure to stay out of range, and if he comes too close, dash past him to the other side of the area, where you will be out of range again. Seath doesn't speed up or become more dangerous as he gets closer to dying. With a Raw Black Bow of Pharis +5, you can deal approximately 42-45 damage per hit with a Hawk Ring equipped, and killed Seath with a little over 100 arrows. This method works for any character build, not just archers.
Alternatively, it is easier to run to either side of the arena and get a few head shots as he makes his way back to the other side. Run back and forth from the fog wall and the area where the glowing crystal was. With 40 dexterity and a Black Bow of Pharis +14 it takes less than 50 Large Arrows (head shots). This strategy prevents his attack animations.
Equipment load under 25% is highly recommended to cut his tail.
Lure Seath as close as possible to the crystal. It is ideal to kite Seath close to one of the walls, so that when he attacks with his breath, you have plenty of room to move around his other side. Once Seath is close enough to you he will pause and begin his breath attack; immediately run behind Seath. Run to his left side (= your right side), as he breathes his crystal breath from his right to his left. Seath will destroy the crystal with his own breath attack and be stunned temporarily. Without locking on to him, target the tip of his back (middle) tail and attack it while two-handing your highest damage weapon or using fast strong spells.
Use weapons that have vertical slash when two-handed: katanas, straightswords, greatswords, ultra greatswords, etc. Slash the tip once or twice, then run away. Provoke him to attack with his crystal breath, run to his tail, slash once or twice again, then repeat.
You can also use fast spells to cut his tail. Unlike using weapons, it is recommended to retreat from the boss battle (Homeward, Homeward Bone, or quit game) if you fail to cut it on the first try after breaking the crystal.
- Great Combustion:
on NG, with Pyromancy Flame +10, you can cut his tail in about three Great Combustion casts. on NG+, an Ascended Pyromancy Flame +5 is recommended. Wear Crown of Dusk and Bellowing Dragoncrest Ring for stronger pyromancies.
- Wrath of the Gods:
Maximize Wrath of the Gods' damage by using Darkmoon Talisman with 50 Faith and wearing Crown of Dusk and Ring of the Sun's Firstborn.
Make sure you don't attempt to cut it at the base or middle of the tail, but rather the tip, as this is the only place where it can be cut off, plus he will likely kill you with tail slams, tail swipes, and his Nova crystal attack if you are close/mid range behind him.