Inzomnia (1997)

Inzomnia is an ancient witch that spent the last 700 years in torpor and is uncovered in a building location in today Buenos Aires. There is also a mysterious box that contains the elements to the alchemy's formula to immortality. But the most important ingredient is missing: the last love breath given to her. Inzomnia tries to seduce young Lucio, son of Manuel, building businessman and occultism adept, that keeps the box with him. Inzomnia then turns into the young and sweet Magdalena. The final struggle within Manuel and Inzomnia will decide which of them can reach the immortality gift.