A Yakshini is a species of a supernatural entity, in some ways similar to a fairy. A Yaksha is a male, a Yakshini female. In the Uddamareshvara Tantra 36 of these beings are described, together with their mantras and ritual prescriptions. By soliciting their aid various powers are said to accrue to the devotee.

Is it possible that we directly call Apsara and Yakshini directly in Aakash element? If we call them they have to come! Definitely, it is possible. But this can be done through Tantra procedure only. Because we have to make one indicator of Aakash element through which we can coordinate with Aakash element and after this if we do Aavahan of anyone so that we can establish contact with them.