Top 10 Hardest Terraria Bosses

The Top Ten

1 Duke Fishron

Duke Fishron is INVISIBLE at it's second form. But, if you have something like the Last Prism, then it might be as hard as Queen Bee.

Travel through walls and cannot camp it out without dying if not using a slime statue farm. You need wings and titanium armor instead of chlorophyte or hallowed in case you failed to dodge one of his dashes. Together with the hardship of catching his summoning item, he is easily the hardest boss in the game even beating the moon lord who you can farm easier.

I never fight Duke Fishron or Moon Lord, but I'm sure that Duke Fishron speed is quite difficult to dodge.

I've fought him three times now and I had the Solar Eruption AND full Solar Armor on me. I also had the Cosmic Car Key but even with that he is just too fast to get around. Every attack is simple to get around but the dashes are simply unfair. The Moon Lord is a breeze compared to this guy.

2 Moon Lord

Endgame boss, high damage, the eyes are very hard to dodge. Without a nebula or vortex armor, you may find it very hard to kill with a nebula blaze or vortex beater. A solar eruption is useful if you want to beat it easier. When fighting him, make sure to keep the percentage of his eyes similar, and destroy them at about the same time so you can beat the heart straight afterward.

The Moon Lord is very hard. You have to beat it's body parts and the core of the Moon Lord. This could be insane if you have a space gun and use it.

Camp inside nurses room with solar eruption and hit him through the wall

It is easy to kill if you use the nurse strategy, but if you don't hell nah.

3 The Twins

Most players would choose to defeat the destroyer first. Then it is not that hard to defeat since you are most likely to have the mushroom spear and can hide behind walls for its first stage.

Just do the running strategy in a flat and long area with your unicorn and shoot him while it's chasing you

Tricky to deal with as an unprepared player, and the 2 eyes, if synced together healthwise, it will kill you

Very fast and oh my god spazmatism is so hard to deal with particularly in the second stage

4 Plantera

Remember to clear the terrain and be prepared when fighting it for the first time, or you can hardly do any maneuvers in the jungle. It is a large boss with high damage. You can hardly kill it with melee weapons besides spears at that stage of the game. Your bullets are easily wasted since its hitbox is not as large as its reach. You don't even have a raven staff as a summoner and there is no corresponding class set up by the new ores you mine.
Try magic weapons for best.

Easier than I expected however, it still took me from 600 health to 350

Got Terra Blade and STILL cannot defeat it WHY?! I am at somewhere around 80 defense AND I have got full armor SO WHY?!?!?!

This is always the hardest boss for me, I died 5 times with turtle armor before killing it

5 Skeletron Prime

You cannot farm it since its limbs are hard to deal with. When you find the pattern of attack, it is reasonable. Very hard to fight without the north pole or other later weapons.

Hard to kill for mage and summoner, and the vice is really annoying

in my opinion easiest out of all 3 mech bosses, killed him with shadowflame knife

This is skeletron PRIME, not normal. He is not killable with a waterbolt and shadow armour.

6 Eye of Cthulhu

first boss and I still can't beat him, I think its because my small battle field has a roof!

I have full beetle armor, the phantasm, the stardust dragon, and the solar eruption. However, I am still not able to defeat him yet!

This boss should be easy when you join hard mode. If you are a beginner or started a new character it would be best to fight king slime before you fight the eye of cthulhu. It is recommended to have a musket with a couple hundred bullets and at least 10 defense points.

The eye of Cthulhu is extremely easy. I beat him first try with wood armor and a tungsten sword. I would say this boss is easy, and if anyone isn’t able to beat it, they are not good at game.

7 Wall of Flesh

Not easy without piercing or aoe weapons. Very hard for melee in my opinion

EASILY the easiest boss ever I killed him with moltin armor moltaves and beenades

Well, I beat him with 11 golden hearts and a titanium sword, not as hard as I thought.

Bone javelins with jungle armor is what I beat this man in expert with

8 King Slime

Bruh this is easily the hardest boss in the game. I think it is literally impossible to beat and definitely needs to be rebalanced. If it is even beatable does anyone have any tips on beating this monstrosity.

The hardest boss ever. It makes the game unfair and impossible on how good it is. Make this boss easier in version 1.4 please. 1 vote= one vote for easier King Slime!

This is literally the easiest boss in the game why is this here

Way to powerful I have the last prism and nebula armour and I still can not defeat this overpowered boss it is so hard.

9 Ocram

It used to be in the Mobile version of terraria so I know. It has a lot of forms of attack and is hard to dodge. It easily kills a player in hallowed armor if he is not dodging properly. The summoning item was expensive to make.

Using the razor blade typhoon with no armour you can win easily

Dude you just gotta get the right armor and gold hearts and you can kill him with a wood sword

With complete turtle armour the Terra blade wings and a twenty by twenty box around you he's easy I've beaten him 13 times and I've spawned him 13 times so...

10 Golem

Easiest to farm although it might be a bit damaging and tough. Its attacks are very simple to observe and dodge.

Whilst Golem is easy, King Slime is miles easier.
For starters, King Slime is the very first boss you fight, whilst Golem is one of the last bosses you fight.

Then there's the fact that King Slime can be cheesed by building 30 Ropes up into the sky and throwing shurikens down at him.

This is the easiest boss ever. Lock it in a box, set up traps, and its dead.

Golem is the most pathetic boss ever, You can just put him in a box and boom, you win.

The Contenders

11 Green Slime

I honestly don't know how to fight this boss. I fought it with full vortex armour, a coin gun shooting millions of plat coins, and a S.D.M.G, but before I died, it came in my mansion, killed all my NPCs, raided all my chests, and knocked the whole thing over. If anyone knows how to hack and kill it, please come in my world and reduce it's 100,000,000,000,000,000,000 health to zero. It's to OP, please nerf.

It is the king of all that is unholy, I have died more to this monster than every other monster combined.

I've used full nebula armor, all the magic buffs, and the last prism, yet I only managed to deal 5 damage to this thing. The 14 max health is far too much for a post-ML boss, and that doesn't even count the 28 health it gains in expert mode. Even with a skybridge stretching across an entire large world, complete with campfires, heart lanterns, stars in a bottle, and bubble blocks for the cute fishron buff, it is near impossible to dodge its jump attack, which deals a staggering 6 damage. Because I've been spending the past month straight on my computer, trying to beat this creature, my family has called authorities repeatedly, who have filed me a missing person, thinking I committed suicide. Terraria has severely damaged my mental health solely because of this impossible boss. After finishing this post, I'm going to uninstall the game, leave a negative review on steam, and sue Re-Logic for creating this horrible game.

Bro this guy is the most ridiculously overpowered super boss ever! His whopping 1 damage destroyed my character instantly, even with full Titan Armor he just destroyed me, and whenever I go back, he kills me instantly.

12 Lunatic Cultist

The second latest boss by progression, however, is not as hard since you can build barriers and beat it easily. You can also parry his magic attacks easily. Mind the dragon.

Lunatic cultist is a breeze with vampires knives, I accidentally summoned him the first time and still won easily

Really deserves to be under Duke and Moonlord in terms of difficulty, but this guy definitely at least deserves the number 3 spot. If you don't have a proper DPS weapon for the cultist himself as well as a decent weapon that can simultaneously attack the segments of the dragon he conjures, you'll find yourself gobbled up pretty quick.

I handled this one very easily why my class is mage lol twins are harder than him speaking of which the twins summoner weapon vs the twins boss!

13 Brain of Cthulhu

The brain of Cthulhu was so easy that I could beat him with wood gear

How is this easier than a green slime?

How do you defeat thi?

Ez it was so easy and not that powerful I didn't even have the first row of red Hearts completed and I still beat him with a starfury so he should be lower than this

14 Eater of Worlds

Hard without right gear, which is grenades, jester arrows, or water bolt. Be wary of it splitting up.

I summonened him in jungle and a drop from that orb was super good aginst him, it summoned a weird vine staff

I literally just swung my sword and took it out first time. Loss 1 heart

I mean you think that is hard no

15 Queen Bee

Just not easy, even with post skeletron gear, the bees are very annoying without a a swingable weapon

This is a hard boss of it making her defenses stronger and it's pretty hard

Maybe to you but not to me

I defeated 10 in 1 day!

16 The Destroyer

Eater of Worlds but shoots lasers. Use magic weapons like the Space Gun/Last Prism.

Well, very tough, very damaging and annoying, but its attacking pattern is so simple that you can just build a platform and cut it off with your night's edge, which is a pre-hardmode weapon.

Pretty hard boss but he is very easy compared to the other two mechanical bosses

Me and my friends kept hitting him. Got our inventories full of headstones, died a lot, but he died too

17 Dungeon Guardian

Why is he not number 2 (number one would be moon lord who isn't a troll boss)

I have solar flare armour and star wrath he is so fast and he one shots me

I have killed it on xbox 360 but, it took A LOT OF Timing. it should be 1# or 2#

But I thought it was the hardest
As it has a lot of defense
And one shot you

18 Skeletron

So Easy as soon as you have at least gold armour and a bed close by it's so Easy

It was hard for me, I was in expert mode and had full Molten Armor and a Nights Edge.

Hard as hell in expert mode

Hardest in expert mode

19 The Lunar Pillars

Very hard. All. Even if you beat em all, the Moon Lord becomes summoned.

How do you think the nebula pillar is easy!?!?!?! I haven't even beaten it and its going underground!

The nebula pillar is somewhat easy but the solar pillar is INSANE took me 7-15 deaths with post moon lord weapons+UFO

They are easy until you get to the last one and realize that the moon lord is being summoned and you don't have an arena

20 Supreme Calamitas

It is very hard and has a ton of health, I mean, come on, it has to be #1 hardest boss in this game, but it is only in Calamity mod.

If modded bosses can be on the list then scal easy number 1 but if not then why is he here

Honestly I believe that she should be higher on this list I am fighting her right now she is the definition of hell

This is calamity mod, not normal terraria.

21 Slime

What the beep this is just so eazy its not even a boss, all you need is a weapon that does 1 damage. Whoever can't beat this is a noob no even worse a failure.

I had Terra Blade, and Full Titanium Armor but ONE HIT and I was wasted

It killed me one hit with full stardust stuff and an invincibility mod with terra blades

Me and my friend played through the whole game and it was easy. We killed Duke Fishron and Moonlord first try. At the end we had solar armor, Terra blades, and even the last prism. We also had a pretty legit castle base with a lava pit and all the npcs. I thought we beat the game. That was until this boss came out of a bush and flew into our castle and killed me in one hit within a single frame. I couldn't even react in time. My friend managed to get 1 damage out of its 700,000,000,000 health before dying the next second. It left our castle destroyed and everything was on fire. It also killed all of our npcs before flying away. If you see this boss run for your life, IT IS IMPOSSIBLE!

22 The Devourer of Gods

To easy I killed him in one hit


He is my favorite Boss. though he might be hard.

he killed me 999 time befor I beat him

23 Ice Queen

Real tough boss. Although only a mini-boss, the ice queen is really had to beat and doesn't guarantee a good drop, making its single defeat a low yielding work. It is even more annoying after 12 waves of the frost moon, as you may see a couple of these at the same time.

Really hard for a miniboss

This is VERY VERY VERY hard please nerf

24 Lepus (Mobile Version)

Easier than green slime

Just get spider staff and like the fiery greatsword, ez pz. Literally took out 3 times in a row.

Kinda hard.

He’s respawns because he lays eggs I hate lepus

25 Harpy Feather

Harpys are hard and what are harder is is the Harpy's feathers and they "TIKILL" get it? ? tikill

I like trees

so hard


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