Eidolon size and additional legs


Rules Questions

Grand Lodge

If my eidolon's base form is bipedal and I take additional legs (up to 4 total) I would stay size medium.

So the question is when I gain the large evolution or cast enlarge person on it, will I be 10'/5' or 10'/10'. I only question this because the creatures it is slightly being modeled after (Centaur, Lamia, Drider, etc.) all have 10'/5'.

On a side note, I do think it is slightly odd that a medium bipedal eidolon with the legs evolution x4 would have 8 legs and still me medium.


A medium drider would have eight legs. So would a medium octopus.

Grand Lodge

Abraham spalding wrote:
A medium drider would have eight legs. So would a medium octopus.

Driders are large and Octopuses have 8 tentacles (as does Ursula).

All tauric creatures presented in the bestiary have 10'/5'. Hence the nature of my question.


Xen wrote:
Abraham spalding wrote:
A medium drider would have eight legs. So would a medium octopus.

Driders are large and Octopuses have 8 tentacles (as does Ursula).

All tauric creatures presented in the bestiary have 10'/5'. Hence the nature of my question.

So you've never had a drider (or other multilegged creature) under the effects of a reduce person spell or at medium size?

Do you accept that in D&D a creature can be medium size and have more than 4 legs?

Like the Aurumvorax, giant ant, giant spider, or Aranea?


Whats really silly is Diminutive creatures with more than four legs... lol whot?


Why would additional legs make something larger? Ticks, very tiny things, have 8 legs.

Grand Lodge

I love how everyone that posted on this commented on my last statement that I found odd, and not the actually question I presented. *sigh*


I would say casting enlarge person on a medium sized creature would make them 10/10. Because thats exactly what happens when you cast it on a medium sized pc, I don't see why it would be any different for an eidolon.


Are you asking about space and reach or facing. Facing is a throwback to 3.0 and should be ignored.
A centaur has space 10 and reach of five, because it has 'undersized weapon'. If your eidelon is medium (in terms of the torso ie claw or weapon damage) I would rule it as 10' with 10' reach. Enlarge person on a medium humanoid gives it the 10s/10r. If you have a medium eidelon modeled on a centaur/lamia/drow then its biped part should be small. In which case I'd rule 10s/5r when it is enlarged. I doubt you are using small weapon damage (not really an option with an eidelon is it?) so I am more inclined with the latter. However in a homebrew I would run it as small weapons on a medium creature. Simply because centaurs are cool and it is good eidelon concept.


Some Random Dood wrote:
I would say casting enlarge person on a medium sized creature would make them 10/10. Because thats exactly what happens when you cast it on a medium sized pc, I don't see why it would be any different for an eidolon.

The difference is pc are humanoids which is specifically mentioned in the spell. Eidelons MIGHT be humanoid.

now I am curious why biped with additional legs instead of quadroped with additional arms?

Grand Lodge

I am referring to space and reach. But it seems that by RAW, it wouldn't have a small torso. It would have a medium sized torso, so therefore, all the benefits of a quadruped with none of the drawbacks?

Biped gets +2 more Strength than quadruped and a higher will save. Not to mention the additional legs were an after thought. Mainly because pounce with 4 claw attacks would be kind of nice.


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Xen wrote:

I am referring to space and reach. But it seems that by RAW, it wouldn't have a small torso. It would have a medium sized torso, so therefore, all the benefits of a quadruped with none of the drawbacks?

Biped gets +2 more Strength than quadruped and a higher will save. Not to mention the additional legs were an after thought. Mainly because pounce with 4 claw attacks would be kind of nice.

Biped base form can't take Pounce no matter how many legs you give it. (only available to quadruped base form)

But, since he has the biped base form, when you make him large, then he will gain 10' reach, whereas a quadruped base form would not.

Grand Lodge

EvilMinion wrote:
Xen wrote:

I am referring to space and reach. But it seems that by RAW, it wouldn't have a small torso. It would have a medium sized torso, so therefore, all the benefits of a quadruped with none of the drawbacks?

Biped gets +2 more Strength than quadruped and a higher will save. Not to mention the additional legs were an after thought. Mainly because pounce with 4 claw attacks would be kind of nice.

Biped base form can't take Pounce no matter how many legs you give it. (only available to quadruped base form)

But, since he has the biped base form, when you make him large, then he will gain 10' reach, whereas a quadruped base form would not.

Thank you very much.

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