Ambrus
Explorer
The friendly NPC who offers to help the PCs out one time when mystically called upon seems to be a recurring plot element in a fair number of campaigns. I'm just curious, what's the best 3.5 device to enable this? Is there some single-use magic item or enspelled token an NPC can give a PC which they could later use to call the NPC to their presence, a la teleport or plane shift? I'm thinking of having an NPC offer such a device to a PC. I could easily invent one, but it seems it should already exist somewhere.