Chrestidus

Chrestidus is the 'divine useful one' , the 'good servant deity'. Chrestidus is the 'son of' Auramazda in the sense that Chrestidus is a partial aspect of Auramazda. Chrestidus is conscious human pursuit of the Good through service to others. Chrestidus can be seen as the 'highest' aspect of Auramazda, and hence described as the 'favourite son of Auramazda'.

N.B. 1. Chrestidus is short for Chrestideus, i.e. 'the servant god'
N.B. 2. 'Chrestius' is a possible short form for Chrestidus