Your summoning spells gain an element of surprise. You can summon creatures that come into existence with the benefit of a spell such as invisibility or bull’s strength.
Prerequisites: Augment Summoning, Spell Focus (conjuration).
Benefit: When you cast a spell from the summoning subschool, you can choose to grant the summoned creature (or creatures) the benefit of any spell of 3rd level or lower you can cast that has a range of touch. You cast the spell you wish to grant the creature (or creatures) (using a prepared spell or a spell slot) at the same time you cast your summoning spell. The creature (or creatures) gains the benefit of the spell when it (or they) appears.
An imbued summoning spell uses up a spell slot one level higher than the spell’s actual level.
Source: Player’s Handbook II, page 92. Errata corrected for errata.