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1. Tarrasque's acrobatics = +46 (15 str, 3 skill, 24 racial, 4 movement), listed +43.
2. DC for a 12-foot high jump = 48. 16-foot high jump = 64.
3. DC for a 40-foot long jump = 40. That is max jumping distance.
4. Rushing Tarrasque = +90 (46 base + 12x4 (150 ft speed)), listed +87.
5. DC for a 22-foot high jump = 88. 26-foot high jump = 108.
6. DC for a 90-foot long jump = 90. 105-foot long jump = 105.
7. Height of a Tarrasque = ~50 feet
8. Length of a Tarrasque = ~75 feet (assuming 55 foot tail + 20 foot body)
Tarrasque link and Acrobatics link
Average high school male long jump = ~15 feet, 20 if athletic
Now, granted, a large body requires more proportional muscle to move, but this creature is built to jump, and seems a bit unimpressive for a CR 25. Are these numbers correct- is this what the Tarrasque's limits are meant to be?
While on it, the average halfling can jump higher than the average giant if I'm not mistaken (at least the giant can reach higher). Or... am I mistaken? Please accurately say yes...

Troubleshooter |

What I'm seeing is that Tarrasque can't really do crap against flying opponents, again. He can jump 25 feet? That's the base range of a first level caster's Close-range spells.
Have him treat high-jump DCs like long-jump DCs and I think I'll be happy.
Edit: Although, I recall his Carapace negates a lot of missiles and reflects others, so flying opponents may not be terribly useful anyhow -- forcing them to be 25+ feet high, versus 100+ feet high, makes little difference.

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I'm thinking to have an NPC own a fairy-sized (tiny) tarrasque, essentially a pseudo-tarrasque. A familiar, actually. It'll be vicious enough to bite a finger off if allowed, but otherwise not much more than one hell of a living punt-toy. All I have to do to make it one hell of a jumper according to the rules is to give it 10 strength, +2 acrobatics. It could jump 3 feet high and 10 feet long without trying. Pretty impressive for a 6 inch critter.
But don't forget, a typical giant would have a hard time doing the same thing... right? The purpose of the thread was to see if this is an accurate understanding of the jumping rules. Raving has the right idea! However, the tarrasque is not running- its base speed is increased to 150. Thus the bonus does apply. That did make me realize, though, that it ends up being +86, not +90, by the stats, because there is +4 in the base value from moving 40 feet.

Rats Archive |

There is a non-linier growth in the force required to lift more massive objects farther from each other, and it is not associated with the objects height. I'm actually surprised the terrasque can jump that high. Consider the difference in your ability to jump compared to a flea, or a cat even. Small things jump disproportionately well. /shrug

Doomed Hero |
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Consider the difference in your ability to jump compared to a flea, or a cat even. Small things jump disproportionately well. /shrug
A flea can jump disproportionately well for it's size.
Fleas can jump about a foot and a half. So can a rhinoceros. A flea is impressive because a foot and a half is hundreds of times it's own body length. A rhino is really unimpressive in that department for inverse reasons.
The rules simply do not reflect this.
A creature with a +20 racial bonus to Jump that is Tiny should not be able to jump as far as a creature with a +20 that is Gargantuan. Heck, the Gargantuan creature's stride is probably bigger than the Tiny creature's max jump.
Large creatures tend to be faster and have higher relevant stats than smaller ones, which helps make up some of the discrepancy, but it's not really enough.
If we imagine that a normal sized flea has a +20 racial jump check (for the sake of argument). Then some druid makes it bigger. It's Racial bonus stays the same. It can now jump ever so slightly farther than it could before, thanks to it's increased stats, even though it should have it's jump distance increased by the same ratio as it's size. The rules just don't support this at all.
As for the "They can jump less far because they now weigh more" argument, it doesn't hold water in a fantasy setting. A giant, physiologically speaking, should not be able to stand upright. It's bones would never support it. They would have to be denser than diamond. It's muscles and ligaments would be under more tension than the cables of the Golden Gate bridge. We ignore those things for the sake of the setting.
Our hypothetical giant flea has been augmented by magic. The idea is that it should behave exactly like a normal sized flea, only bigger. That means size-proportionate leaping.
The Terrasque's racial bonus to Jump should either be much larger, or jump bonuses should mean more for larger creatures.

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Mass-to-strength ratios have been reduced to allow "cool" things like giants and dragons (not to mention monks with insanely high jumping abilities.) For the most part, "cool" really big monsters are cool by staying on the ground, and possibly causing it to rumble when they charge. You run a real risk of Elephant-on-a-Pogo-Stick giggles if you announce that the brontosaur just leapt over the city wall. I warn ya.