How to Defeat Psaro in Dragon Quest IV
How to Defeat Psaro in Dragon Quest IV

You’ll find Psaro the Manslayer after getting through his castle, which is the last dungeon of Chapter 5. This will be the hardest and longest battle in this chapter, so get ready!

Preparations

  • Be around level 36. You can grind by farming Metal Slimes outside Azimuth town. Having the Liquid Metal Sword and the Falcon Knife Earrings (so you can attack twice) will make the grind easier.
  • Get the best gear available. Full Zenithian Gear on your hero, the Liquid Metal Sword on another character, and the best armors you can buy. This will be the final fight so no need to save money!
  • Get the Baron’s Bugle. This is an optional item, but having it will allow you to change your line-up mid-battle. Swapping party members during the fight will make it much easier, and you’ll need every bit of help. See our guide on how to find it!

Navigating Psaro’s Castle

After reaching the underworld and breaking the four barriers, you’ll be able to enter the main castle in the middle. Enter it and head east, avoiding the magic floor that can damage you. Follow the path until you find the stairs.

Some directions to reach the second floor (1) | Dragon Quest IV
Some directions to reach the second floor (2) | Dragon Quest IV
Some directions to reach the second floor

Exit the small room and you’ll be at the castle’s terrace. Follow the path north to enter the castle again. Walk until you reach the big empty space where an elevator would go, and walk up the stairs to your right. 

Follow these directions to get to the next floor (1) | Dragon Quest IV
Follow these directions to get to the next floor (2) | Dragon Quest IV
Follow these directions to get to the next floor (3) | Dragon Quest IV
Follow these directions to get to the next floor

Follow the only path available until you find an elevator. Step on the middle button to make it go down to the previous room, allowing you to cross through to the other side. Go east now until you find the next stairs.

Go this way and make the elevator go down (1) | Dragon Quest IV
Go this way and make the elevator go down  (2) |  Dragon Quest IV
Go this way and make the elevator go down (3) | Dragon Quest IV
Go this way and make the elevator go down (4) | Dragon Quest IV
Go this way and make the elevator go down (5) | Dragon Quest IV
Go this way and make the elevator go down

You’ll see another elevator to your right. Step on it to make it go down, then take the same stairs to go up again. With the elevator on the floor below, you can walk on its roof and get to the other side. 

Walk over the elevator roof to get to the other side of the pit (1) | Dragon Quest IV
Walk over the elevator roof to get to the other side of the pit (2) | Dragon Quest IV
Walk over the elevator roof to get to the other side of the pit (3) | Dragon Quest IV
Walk over the elevator roof to get to the other side of the pit

After a couple of rooms you’ll get outside at the terrace again. Enter the western door to reach the last room and exit the castle. 

Head this way to exit Psaro’s Castle (1) | Dragon Quest IV
Head this way to exit Psaro’s Castle (2) | Dragon Quest IV
Head this way to exit Psaro’s Castle

Fighting Psaro

You’ll be at the foot of what looks like a volcano. If you have the Baron’s Bugle you’ll have to use it here to call your carriage. It is highly recommended to do this, as it will allow you to fight with your entire party instead of only four of them. 

Heal everyone and head up to find Psaro, who now transformed himself into something similar to Estark but in another color. Approach him to start the final fight.

Psaro (first phase) | Dragon Quest IV
Psaro (first phase)
2000HP, attacks twice, can do a Desperate Attack
The fight starts pretty easy. He can only do physical attacks. Cast Sap on him and Kabuff on your party and keep attacking while also keeping everyone healed. After a while you’ll blow off his arm! 
Psaro (second phase) | Dragon Quest IV
Psaro (second phase)
2000HP, can do a Desperate Attack
With one arm less he can only attack once per turn, so this phase is easier than the previous one. The exact same strategy work here: keep your party buffed and healed and attack until his other arm falls off.
Psaro (third phase) | Dragon Quest IV
Psaro (third phase)
1600HP, can cast Crackle, Kabuff, Sizzle, Whack and Sweet Breath
Without his weapons he’ll resort to spellcasting. Most attacks damage all your party but do less damage than the previous phases. Whenever he buffs himself use the Zenithian Sword as an item to nullify it. After fighting for a bit his head will fall off.
Psaro (fourth phase) | Dragon Quest IV
Psaro (fourth phase)
1800HP, can cast Disruptive Wave, Meditation, Scalding Gas and Inferno
A new head appeared on his belly! He can use Meditation to heal himself now, making things a lot harder. He also mixes up a lot of physical and breath attacks, so cast Kabuff and Insulatle to protect your party from both attacks. This will probably be the longest phase in this fight… but not the last one.
Psaro (fifth phase) | Dragon Quest IV
Psaro (fifth phase)
1600HP, attacks twice, can cast Inferno and Scalding Gas
Psaro grows new arms and goes berserk. At least now he can’t heal himself like in the previous phase. The same strategy as before applies: Sap on him, Kabuff + Insulatle on your party, and physical attacks until he goes down. If your healer is low on MP, this would be a good moment to swap him for another one.
Psaro (sixth phase) | Dragon Quest IV
Psaro (sixth phase)
1700HP, attacks twice, can cast Inferno
He grows legs now and gets faster. He may even attack before your party members if they don’t have enough agility. Same strategy as before until the phase ends.
Psaro (last phase) | Dragon Quest IV
Psaro (last phase)
2100HP, attacks twice, can cast Disruptive Wave, Chilly Breath, Inferno and Bounce
A new head grows, the music changes… This is the final phase! He can cast Bounce on himself now, but you can use the Zenithian Sword to dispel it. Keep your healer alive at all costs and attack non-stop with either Alena or Ragnar, while your Hero heals or attacks accordingly. Prioritize healing more than attacking and this last phase should end soon.

Finally, after the longest battle in the game, you’ve beaten Psaro! The ending sequence will play after that, and you’ll be able to save after the credits. 

On the Nintendo DS version of the game, loading that save will let you play Chapter 6, with a new and quite long dungeon, and new bosses.