Demand

This spell is essentially the same as a sending spell. 

Demand differs from sending in that the spell caster may phrase his or her message so as to contain a suggestion spell and if the subject fails to make its saving throw versus spell, it will do its best to carry out the suggestion contained in the message of the demand.

Of course, if the message is relatively impossible or incongruous according to the circumstances which exist for the subject at the time the demand comes, the message is understood but no saving throw is necessary and the suggestion is ineffective. 

The material components of the spell are a pair of cylinders, each open at one end, connected by a thin piece of copper wire and some small part of the subject creature — a hair, bit of nail, etc.