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Kmcdswan wrote:

Dear James Jacobs,

I'm playing a summoner and my summon is medium sized and possesses the Ability boost Strength evolution 2 times. I want to cast Evolution surge to make my eidolon large sized (a 4 point evolution as per the spell), when doping this should I re figure the Ability boost so that I only have it one time (getting a total strength boost of +10[8 from large sized and once from ability boost]), should I leave it alone as is (getting a total of 12 Strength [8 form large and 4 from having ability boost twice]), or can I simply not cast evolution surge to grow larger? The reason I haven't simply take large size is because we frequently go into cramped dungeons where a large sized creature would be awkward so I'm a little afraid of making my eidolon large sized on a regular basis.

Thank you.

Evolution surge doesn't make you lose existing evolutions. It gives you a new one. When you cast evolution surge on an eidolon to grant it the Large evolution, it gains untyped bonuses to its ability scores. Likewise, the Ability Increase evolution (I assume this is what you're talking about with the "Ability boost Strength evolution") grants untyped bonuses. As a result, they add together and stack; your eidolon would gain a net +12 to its Strength score.

Dear James Jacobs,

While I appreciate your answer I do not believe I clearly expressed the question I was asking. I was referring to the fact that under the Large sized evolution it states that if you take this evolution then ability boost Strength and Ability boost Constitution cost double their usual cost. How would I reconcile that with my eidolon who has already purchased ability boost strength twice at a cost of 2 evolution points per time he has learned it. Sorry to ask again, and hopefully this time I has actually asked what I wanted you to answer.

Dear James Jacobs,
I'm playing a summoner and my summon is medium sized and possesses the Ability boost Strength evolution 2 times. I want to cast Evolution surge to make my eidolon large sized (a 4 point evolution as per the spell), when doping this should I re figure the Ability boost so that I only have it one time (getting a total strength boost of +10[8 from large sized and once from ability boost]), should I leave it alone as is (getting a total of 12 Strength [8 form large and 4 from having ability boost twice]), or can I simply not cast evolution surge to grow larger? The reason I haven't simply take large size is because we frequently go into cramped dungeons where a large sized creature would be awkward so I'm a little afraid of making my eidolon large sized on a regular basis.

Thank you.

For what it's worth as regards this discussion the only clear rule I've read or seen quoted on this thread states that Untyped bonuses stack with each other unless they come from the same source and that generally bonuses of the same type don't stack with each other. So, unless I'm misreading Defending, an enhancement bonus that stacks with all others counts however many times you can apply it which, since it can only be applied to a weapon and weapons only work when in the handheld slot, could only conceivably be stacked a number of times equal to your arms (i.e. a Human can have 2 but a Xill could have 4). I'm not trying to enflame this argument any further; I just haven't seen somebody post a ruling that said named bonuses which say they stack don't stack if they're from the same source that isn't a spell. If I misread something please post a link to the internet or a page number and book title.