Detect Spells (Alightment, Undead, Magic...) Question

[Luecian]

Is there a spell that lets you get around these effects. I have a Vampire NPC that my players are very found of Detect Undead, but for Plot, and the fact I want to stick within the rules I was wondering if there was a spell or even magic item that could be worn that would mask the Evil and Undead presence. That a simple Detect Undead or Evil wont pierce through.

[Lord Foul II]

nondetection forces them to make a caster level check
DC 15+you caster level if you cast it on yourself DC 11+caster level if someone else does it for you
and there is an 8th lvl spell, I think it's called mind blank that gives immunity to all divinations.

[Magic Butterfly]

Sure are! A Ring of Mind Shielding will stop all of that. A Nondetection spell is 1 hour/day. Misdirection is also 1 hour/day, and as an added bonus can be used in such a way as to have your vampire actively detect as a living being, or as good-aligned.

[Luecian]

You two are awesome, thank you.