Magical Shield Up
Right click the link to the sample below, choose "Save target as ..." and save it with your other sounds.
I don't know a lot about magic but I do like those magical shield things. I believe there are several spells of this type. The trigger phrases where taken from the most basic one but may well work for higher powered versions. This sound triggers when you (or somebody else in the same room) has a magical shielding spell successfully cast upon them. Very handy.
Thanks go to Xenophor for the original idea of creating triggers for this and to keen young Shro for helping me extensively test the triggers.