Ancestral Blessing

This spell can be used by a character of any class who is at least 3rd level or higher and the head of his or her household. The caster of this spell calls upon the spirits of his ancestors for advice or protection. Providing the caster maintains an altar to his ancestors in his home and sacrifices food to them each day, the spirit of one of the individual’s ancestors will answer the
summons. 

The ancestor spirit will either answer one question (with 75% accuracy), or bestow a blessing on one character of the caster’s choice. This blessing takes the form of a +1 modifier to the character’s saving throws that lasts for the duration of the spell. (1 day per level of the caster) 

Alternatively, the caster can ask the spirit to guard his home. In this case, the spirit acts as an infallible alarm against all non-magical intrusions for the duration of the spell. The spirit will not protect the home, it will simply alert the caster to an intrusion (no matter where he happens to be at the moment).

This spell does not reveal one's ancestors, they can only be reached if they are already known and an altar is already kept to them.

(Adapted from Legends And Lore for AD&D 2nd Edition)