My view on this, EPICLESIS is a form that the christian use to invoke God present right at the begin of the service whether individual or congregation.

The celebration of the sacrament includes the following principal elements: the "priests of the Church in silence lay hands on the sick; they pray over them in the faith of the Church this is the epiclesis proper to this sacrament; they then anoint them with oil blessed, if possible, by the bishop.

The Eucharistic prayer, which has eight parts, namely the Preface, Acclamation, Epiclesis, Consecration, Anamnesis, Oblation, Intercessions, and Doxology goes back all the way to the Apostles, although there have been a few additions over the centuries, it has remained basically unchanged since the Apostles.

There are many prayers prayed by the priest during the Eucharist. I'm thinking that you are asking about a specific one, but this is just a guess. The Canon or Eucharistic Prayer is the central portion of the Eucharistic liturgy, it has eight parts: Preface, Acclamation, Epiclesis, Consecration, Anamnesis, Oblation, Intercessions, and Doxology.