If the colour of these halos should be red, their lord is Indra ; if blue, Yama ; if gray, Varuṇa ; if of the colour of the dove, Nirṛti (a demon presiding over the south-west point of the compass); if of the colour of the clouds, Vāyu ; if variegated in color, Īśānya (a deity presiding over the north-east point of the compass); if green, Kubera (God of wealth); and if white, Agni .