Children of the Night(1991)

Be home before nightfall... and pray for dawn!

In the quiet little town of Allburg, friends Lucy and Cindy are on the verge of going away to college when they partake in a cleansing ritual by swimming in an abandoned church crypt. After Lucy accidentally drops her crucifix in the water, it drifts down and awakens the ancient vampire Czakyr, who becomes thirsty for Lucy's virgin blood.