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Question about evolutions and feats.
Evolution:
Improved Damage (Ex)
One of the eidolon’s natural attacks is particularly deadly. Select one natural attack form and increase the damage die type by one step. This evolution can be selected more than once. Its effects do not stack. Each time an eidolon selects this evolution, it applies to a different natural attack. Source: Advanced Player's Guide
Feat:
Improved Natural Attack (Monster)
Prerequisite: Natural weapon, base attack bonus +4.
Benefit: 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.
could you use both of these in conjunction? I cant find any rule that would not premit. "Its effects do not stack"- pertains to same source and these are each different sources.
They stack, and they do different things. INA increases size of the weapon (effectively), Improved damage increases the size of the die (1d2>1d3>1d4>1d6>1d8>1d10>1d12>1d20). Though, I would rule that it does the same thing as INA since the RAW would have it so that applying them in different orders results in different damage values.
eg:
2d8 base
INA then ID
2d8>3d8>3d10
ID then INA
2d8>2d10>3d8