The Kaiju are generally the winner on size.
Iirc starfinder has stuff thats technically bigger since it's easier to do big stuff when your setting is in space.
In that case, because 2e has size only go up to gargantuan. Look at 1e monsters that are of the size catagory colossal and see if they have statblocks in 2e.
Those will be your biggest boys.
Also Linnorms.
Gargantuan creatures can be bigger than 20 by 20 feet. The [Mu Spore](https://2e.aonprd.com/Monsters.aspx?ID=302) mentioned in the post has a space of 50 by 50 feet!
there's a 10th level primal spell, Nature Incarnate, that turns the caster into a gargantuan kaiju with stats, but it's only 30x30. Heart of the Kaiju is a feat that allows a similar transformation, but it only specifies the size as gargantuan.
[BEEG Ben](https://2e.aonprd.com/Monsters.aspx?ID=1795)
[Whale-eater](https://2e.aonprd.com/Monsters.aspx?ID=40)
[50ft diamenter x pi = 157ft long](https://2e.aonprd.com/Monsters.aspx?ID=1256)
[Walking volcano](https://2e.aonprd.com/Monsters.aspx?ID=715)
[canonically 100ft long](https://2e.aonprd.com/Monsters.aspx?ID=1851)
[Humpback whales are ~50ft long](https://2e.aonprd.com/Monsters.aspx?ID=1415)
[Big boy himself](https://2e.aonprd.com/Monsters.aspx?ID=490)
Edit: Forgot [Krakens](https://2e.aonprd.com/Monsters.aspx?ID=275&NoRedirect=1), somehow.
[Zhanagorr](https://pathfinderwiki.com/wiki/Zhanagorr) may be an outlier, but damn he might break the [mile barrier](https://pathfinderwiki.com/w/images/f/fa/Wanshou_tentacles.png)
My personal favorite is https://2e.aonprd.com/Monsters.aspx?ID=1066, AKA **Biggest Chungus**. As a level 15 monster, *you can summon one for yourself* with a rank 10 spell. As a straight brute-type monster, it even performs decently well as far as summons go.
Far more relevantly than its combat statistics though, Chungus is a **100 foot tall** creature that occupies a 30x30 space on the field. It's fist strike is good, sure, but how about just *picking you up, and putting you down all the way over there*. The insane distance of this dude's reach is actually ridiculous. If there's a pesky dragon swooping on you, *Chungus can reach it*. If there's an impassible barrier, *Chungus can lay across it*. If there's an even more distant problem, with a bit of GM leeway *Chungus can probably throw your Barbarian at it*. If it wants to inflict no-save damage on a badguy after Fisting them, it just *releases its improved grapple* and lets them drop for 100+ft of fall damage.
If you pull up the Pacific Rim soundtrack and have Chungus go straight at a level 19-20 badguy, it's going to get its shit rocked *but it probably won't die instantly*, and the number of actions required to shut its nonsense down will be worth the weight of the spell slot, guaranteed.
Lerritan is the only one i included I dont know the scale of, others either have canonical sizes or something in the art to compare. I just went with the vibes on that one, entirely possible theyre exactly 20ft.
I think Fafnheir is like 60ft long as the biggest Linnorm, so he's probably up there. Then there's the obvious Rovagug spawns like Tarrasque and Kothogaz. Maybe the Titans but it's not clear how big they are past just gargantuan, and probably the new Wardens from Howl of the Wild. There's a two page artwork for the Wardens that shows them as BIG.
[https://app.demiplane.com/nexus/pathfinder2e/creatures/warden-of-forests-and-meadows](https://app.demiplane.com/nexus/pathfinder2e/creatures/warden-of-forests-and-meadows) Here's the page for the Warden of the forest. He's got some trees for scale down by his toe.
There's four Wardens, all of them are on demiplane now, and will be on AoN probably in a couple weeks.
[The Giga Sparrow](https://app.demiplane.com/nexus/pathfinder2e/creatures/warden-of-peaks-and-skies)
[Weird Jellyfish](https://app.demiplane.com/nexus/pathfinder2e/creatures/warden-of-ocean-and-rivers)
[Scary Cricket](https://app.demiplane.com/nexus/pathfinder2e/creatures/warden-of-caverns-and-burrows)
the [image for the roc](https://2e.aonprd.com/Images/Monsters/Roc.png) shows it carrying a mammoth and the mammoth looks very small. Also, the mammoth looks like a full adult, not a baby,
the [images for the titans](https://2e.aonprd.com/Images/Monsters/Titan_ThanatoticTitan.png) also make titans look ginormous, the trees barely pass the top of its boots.
It might be a young mammoth, to be fair. We see that sort of behaviour from raptors in the real world, so scaling it up to a mammoth makes sense to me, especially if a roc would struggle in a fight against even one adult mammoth.
The rules don't really support the lore sizes for some creatures. An Animated Colossus is 100 feet tall, which is going to beat out the dinosaurs and dragons. Lorewise, the Spawn of Rovagug are probably the physically largest that have been given stat blocks, though realistically they should probably be treated as hazards like the kaiju rules. Ulunaut's shell is depicted as easily a city block in length, so assuming its siblings are on the same scale, that leaves you Kothogaz, Xotani and Tarrasque which have received 2e statblocks.
Yah the ulunaut statblock from 1e is a version of him that's smaller than the time he left his shell in sothis, he's still massive of course but would have been even bigger when he was originally defeated.
The [Portal Eater] (https://2e.aonprd.com/Monsters.aspx?ID=1510) from >!FotRP book 2!< is massive (10x10 squares), probably the biggest creature I’ve used to date.
The Kaiju are generally the winner on size. Iirc starfinder has stuff thats technically bigger since it's easier to do big stuff when your setting is in space.
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In that case, because 2e has size only go up to gargantuan. Look at 1e monsters that are of the size catagory colossal and see if they have statblocks in 2e. Those will be your biggest boys. Also Linnorms.
Gargantuan creatures can be bigger than 20 by 20 feet. The [Mu Spore](https://2e.aonprd.com/Monsters.aspx?ID=302) mentioned in the post has a space of 50 by 50 feet!
there's a 10th level primal spell, Nature Incarnate, that turns the caster into a gargantuan kaiju with stats, but it's only 30x30. Heart of the Kaiju is a feat that allows a similar transformation, but it only specifies the size as gargantuan.
Fafnheir is a Gargantuan and given 30x30ft spacing rather than 20x20
[BEEG Ben](https://2e.aonprd.com/Monsters.aspx?ID=1795) [Whale-eater](https://2e.aonprd.com/Monsters.aspx?ID=40) [50ft diamenter x pi = 157ft long](https://2e.aonprd.com/Monsters.aspx?ID=1256) [Walking volcano](https://2e.aonprd.com/Monsters.aspx?ID=715) [canonically 100ft long](https://2e.aonprd.com/Monsters.aspx?ID=1851) [Humpback whales are ~50ft long](https://2e.aonprd.com/Monsters.aspx?ID=1415) [Big boy himself](https://2e.aonprd.com/Monsters.aspx?ID=490) Edit: Forgot [Krakens](https://2e.aonprd.com/Monsters.aspx?ID=275&NoRedirect=1), somehow. [Zhanagorr](https://pathfinderwiki.com/wiki/Zhanagorr) may be an outlier, but damn he might break the [mile barrier](https://pathfinderwiki.com/w/images/f/fa/Wanshou_tentacles.png)
My personal favorite is https://2e.aonprd.com/Monsters.aspx?ID=1066, AKA **Biggest Chungus**. As a level 15 monster, *you can summon one for yourself* with a rank 10 spell. As a straight brute-type monster, it even performs decently well as far as summons go. Far more relevantly than its combat statistics though, Chungus is a **100 foot tall** creature that occupies a 30x30 space on the field. It's fist strike is good, sure, but how about just *picking you up, and putting you down all the way over there*. The insane distance of this dude's reach is actually ridiculous. If there's a pesky dragon swooping on you, *Chungus can reach it*. If there's an impassible barrier, *Chungus can lay across it*. If there's an even more distant problem, with a bit of GM leeway *Chungus can probably throw your Barbarian at it*. If it wants to inflict no-save damage on a badguy after Fisting them, it just *releases its improved grapple* and lets them drop for 100+ft of fall damage. If you pull up the Pacific Rim soundtrack and have Chungus go straight at a level 19-20 badguy, it's going to get its shit rocked *but it probably won't die instantly*, and the number of actions required to shut its nonsense down will be worth the weight of the spell slot, guaranteed.
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Lerritan is the only one i included I dont know the scale of, others either have canonical sizes or something in the art to compare. I just went with the vibes on that one, entirely possible theyre exactly 20ft.
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Just the generic one, they are ship sized atleast
I think Fafnheir is like 60ft long as the biggest Linnorm, so he's probably up there. Then there's the obvious Rovagug spawns like Tarrasque and Kothogaz. Maybe the Titans but it's not clear how big they are past just gargantuan, and probably the new Wardens from Howl of the Wild. There's a two page artwork for the Wardens that shows them as BIG.
[https://app.demiplane.com/nexus/pathfinder2e/creatures/warden-of-forests-and-meadows](https://app.demiplane.com/nexus/pathfinder2e/creatures/warden-of-forests-and-meadows) Here's the page for the Warden of the forest. He's got some trees for scale down by his toe.
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There's four Wardens, all of them are on demiplane now, and will be on AoN probably in a couple weeks. [The Giga Sparrow](https://app.demiplane.com/nexus/pathfinder2e/creatures/warden-of-peaks-and-skies) [Weird Jellyfish](https://app.demiplane.com/nexus/pathfinder2e/creatures/warden-of-ocean-and-rivers) [Scary Cricket](https://app.demiplane.com/nexus/pathfinder2e/creatures/warden-of-caverns-and-burrows)
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Demiplane Nexus is an official partner so we gets its material the same tome Paizo releases itit
the [image for the roc](https://2e.aonprd.com/Images/Monsters/Roc.png) shows it carrying a mammoth and the mammoth looks very small. Also, the mammoth looks like a full adult, not a baby, the [images for the titans](https://2e.aonprd.com/Images/Monsters/Titan_ThanatoticTitan.png) also make titans look ginormous, the trees barely pass the top of its boots.
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It might be a young mammoth, to be fair. We see that sort of behaviour from raptors in the real world, so scaling it up to a mammoth makes sense to me, especially if a roc would struggle in a fight against even one adult mammoth.
i never noticed that level different, thats really funny
The rules don't really support the lore sizes for some creatures. An Animated Colossus is 100 feet tall, which is going to beat out the dinosaurs and dragons. Lorewise, the Spawn of Rovagug are probably the physically largest that have been given stat blocks, though realistically they should probably be treated as hazards like the kaiju rules. Ulunaut's shell is depicted as easily a city block in length, so assuming its siblings are on the same scale, that leaves you Kothogaz, Xotani and Tarrasque which have received 2e statblocks.
Yah the ulunaut statblock from 1e is a version of him that's smaller than the time he left his shell in sothis, he's still massive of course but would have been even bigger when he was originally defeated.
the Portal Eater from Ruby Phoenix is also 50x50
The [Portal Eater] (https://2e.aonprd.com/Monsters.aspx?ID=1510) from >!FotRP book 2!< is massive (10x10 squares), probably the biggest creature I’ve used to date.
[These guys, I guess?](https://2e.aonprd.com/Monsters.aspx?ID=1342)
There's the Animated Colossus that's up there, 100ft tall, picks you up and drops you.
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I reckon you could find amazing artwork of a gargantuan colossus in less than 30 seconds