The method used to summon those being is known as the Blood- Sign Ceremony

The supernatural was brought in by calling its name. Every part of the world had traditions about not using a god’s name in vain or using code words when speaking about fairies.

That had been raised to the level of a ceremony when the Sigil of modern Western magic had created a charm for summoning angels by laying a thin sheet of paper over a special diagram of the alphabet and drawing lines to connect together the name of the angel to be summoned.

The modern summoning ceremony had taken that a step further. This was not contained to one’s mind.
Nor did it leave it up the gods to decide if they would come.

It was a methodology to summon legendary beings into the real world with 100% certainty. The god was not assisting a human; the human was having the god obey him.

(Honestly, it’s like asking for divine punishment. We go beyond our own minds and physically draw out the Materials floating on “the other side” so we can directly use them!!)