The epiclesis refers to the invocation of one or several gods. Wikipedia

Invocation of a god or spirit upon a sacrament or representative Wikidata

The part of the Divine Liturgy or the Mass in which the celebrant invokes the Holy Spirit to change the bread and wine on the altar into the body and blood of Jesus (said at the beginning of the offertory prayers in the Western tradition and at the end of the aforementioned in the Eastern tradition). Wiktionary

Part of the Divine Liturgy or the Mass. Wiktionary (translation)