School transmutation; Level summoner/unchained summoner 2

This spell causes your eidolon to take on new characteristics.

You can grant the eidolon any evolution whose total cost does not exceed 2 evolution points. You may only grant one evolution with this spell, even if that evolution can be taken multiple times.

You can grant an evolution that allows you to spend additional evolution points to upgrade that evolution. This spell cannot be used to grant an upgrade to an evolution that the eidolon already possesses. The eidolon must meet any prerequisites of the selected evolution. This spell does not allow an eidolon to exceed its maximum number of natural attacks.

Evolution Surge, Greater

School transmutation; Level summoner/unchained summoner 4

This spell functions as lesser evolution surge (see above), except that you can grant any two evolutions whose total cost does not exceed 6 evolution points.