It is exactly the same that happens when he goes from medium to large.
Outside the changes of the spell , like the above poster said he takes up more space , gets more reach and gets better damage dices , just check the table to see it.
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It does exactly what the spell says it does:
This spell causes instant growth of a humanoid creature, doubling its height and multiplying its weight by 8. This increase changes the creature's size category to the next larger one. The target gains a +2 size bonus to Strength, a -2 size penalty to Dexterity (to a minimum of 1), and a -1 penalty on attack rolls and AC due to its increased size.
Height doubles.
Weight increases by x8.+2 bonus to strength.
-2 penalty to dexterity.
-1 penalty to attack and AC.
Damage increases one step per the progression:
Choose one of the creature's natural attack forms (not an unarmed strike). The damage for this natural attack increases by one step on the following list, as if the creature's size had increased by one category. Damage dice increase as follows: 1d2, 1d3, 1d4, 1d6, 1d8, 2d6, 3d6, 4d6, 6d6, 8d6, 12d6.
A weapon or attack that deals 1d10 points of damage increases as follows: 1d10, 2d8, 3d8, 4d8, 6d8, 8d8, 12d8.
But this topic should really be in the houserule forum, because enlarge person doesn't work on eidolons.
The summoner may cast a spell with a target of “you” on his eidolon (as a spell with a range of touch) instead of on himself.
Targe: One humanoid creature
Not a target of "You."
It does exactly what the spell says it does:
This spell causes instant growth of a humanoid creature, doubling its height and multiplying its weight by 8. This increase changes the creature's size category to the next larger one. The target gains a +2 size bonus to Strength, a -2 size penalty to Dexterity (to a minimum of 1), and a -1 penalty on attack rolls and AC due to its increased size.Height doubles.
Weight increases by x8.
+2 bonus to strength.
-2 penalty to dexterity.
-1 penalty to attack and AC.
Damage increases one step per the progression:Choose one of the creature's natural attack forms (not an unarmed strike). The damage for this natural attack increases by one step on the following list, as if the creature's size had increased by one category. Damage dice increase as follows: 1d2, 1d3, 1d4, 1d6, 1d8, 2d6, 3d6, 4d6, 6d6, 8d6, 12d6.
A weapon or attack that deals 1d10 points of damage increases as follows: 1d10, 2d8, 3d8, 4d8, 6d8, 8d8, 12d8.
But this topic should really be in the houserule forum, because enlarge person doesn't work on eidolons.
The summoner may cast a spell with a target of “you” on his eidolon (as a spell with a range of touch) instead of on himself.Targe: One humanoid creatureNot a target of "You."
Look at the next sentence,
A summoner can cast spells on his eidolon even if the spells normally do not affect creatures of the eidolon's type (outsider).
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False. "Share Spells" specifically states that you can cast spells with a target of "YOU" on your eidolon, even if the spell wouldn't normally affect a creature of the eidolon's type. Enlarge Person doesn't have a target of "YOU," it has a target of "One Humanoid Creature." See the difference?
See Invisibility has a target of "You," allowing you to share it with an eidolon.
This is a pretty simple concept. Spells target specific things. "Share Spells" allows you to cast spells on your eidolon you otherwise can't cast on any other creatures, because other creatures aren't you. If there weren't a large number of spells that have a target of "You" specifically, then the "Share Spells" feature wouldn't specifically state that shared spells must target "You."
Like it or not, that's RAW.
Yes to all your questions. The eidolon increases in size and so gains increased natural attack damage, longer reach and occupies a larger space along with the spell's listed bonuses and penalties.
cast using share spells is this way
you're still using the word "this", thus the question remains
"This way" = using share spells ability
Enlarge Person works.
You can cast personal spells, and spells that don't normally affect that creature type on your eidolon/familiar/animal companion.
Basically either condition works.
However it must come from that class.
As an example if you are a wizard/summoner the spells you cast as a summoner would use the share spells feature. Your daily wizard spells would not work.
As an example if you are a wizard/summoner the spells you cast as a summoner would use the share spells feature. Your daily wizard spells would not work.
The summoner version of Share Spells only asks for the spell list. So enlarge person from your wizard spells is ok, true strike is not.
The OP pretty specifically said he was aware of the eidolon share spells debate and didn't want a rehash of it here.
For anyone that can't grasp that, perhaps just imagine he was asking about giants instead of eidolons.
The enlarge person spell doesn't specify of course, but it is reasonable to use the reach listed on the table here based upon the new size and body conformation. Natural weapons, just like equipment, should increase damage as well.
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The overall ability that one would have to actually cast this spell should come into focus, even when the OP admitted that there was some debate and arbitrarily decided that he can do this.
Two sentences that are in the same paragraph/stance yet decided that they have nothing to do with one another? Why?
I learned basic English, so just deciding "Hey, a period allows me to ignore basic structure of the language and have 'the rulez' be something else" is not my overall stance to all rulings within the pages of Role/Roll Playing products.
Enlarge Person should not work on an Eidolon. There is also a FAQ concerning stacking of size modifiers on damage/weapons, limiting it to once (1 time).
There is also a FAQ concerning stacking of size modifiers on damage/weapons, limiting it to once (1 time).
When an eidolon has the evolutions for Large, that is the eidolons base size. The same applies to large sized animal companions, Animal Growth makes them Huge.