Imbued Summoning( Player's Handbook II, p. 92)
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.
When you cast a spell from the summoning subschool, you can choose to grant the summoned creature 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 (using a prepared spell or a spell slot) at the same time you cast your summoning spell. The creature gains the benefit of the spell when it appears.
An imbued summoning spell uses up a spell slot one level higher than the spell's actual level.