Raising Heart

Raising Heart is Nanoha's Intelligent Device. Her standby appearance is that of a simple, red, spherical pendant. In combat, she can shift into a variety of forms as the situation dictates to support Nanoha. After being badly damaged in the fight against the guardian knights of the Book of Darkness, she requests to be rebult with the Belkan Cartridge System, taking up the name Raising Heart Excelion after her rebuild is complete.

(Source: Magical GIrl Lyrical Nanoha the Movie 1st and Magical Girl Lyrical Nanoha the Movie 2nd A's)