All 3rd-edition harper agent spells of 3rd level.
“Nondetection (or non-detection) was an abjuration spell that hid the subject from divination and...Nondetection
“Suggestion was an enchantment spell used to compel a subject to follow the caster's orders, but...Suggestion
“Undetectable alignment was an abjuration spell that shielded the subject's alignment from...Undetectable alignment
“Tongues was a divination or alteration spell that allowed the caster or a touched creature to...Tongues