Improved Soul Imprint (3.5e Feat)
From D&D Wiki
Improved Soul Imprint [Racial]
You gain an additional Soul Imprint with additional sizes and creature types available.
Benefit: You can preserve 2 Soul Imprints. When taking a Soul Imprint, and no open imprinting slots are available, you may choose which previous Soul Imprint to abandon. You may take Soul Imprints from small, medium or large-sized humanoids, monstrous humanoids and Giants.
Normal: You may only have one Soul Imprint.