Quote Originally Posted by Vlad_Impaler
Load them on a cog and send them to meet your nearest foes.
I've been thinking about doing that with diplomats who seem to be in a persistent vegetative state (i.e. I wouldn't consider even letting them talk to plants). The minor detail is that the cog costs more than the diplomat and I don't think there's an upside like pumping piety or trying to get a guild.