In The Space Trilogy by C. S. Lewis,eldila (singular eldil) are super-human extraterrestrials. Similar to angels, or devas, and sometimes mistaken for gods, with the oyéresu representing a higher order, perhaps, archangels.

Who are the Eldil in Out of the Silent Planet?

The eldil are sort of a kind of hnau (Hyoi himself does not know) and are like messengers that give messages to the hnau and speak to them. They are very hard to see, and for the most part, can only be seen when chosen to be seen. The greatest eldila on Malacandra is Oyarsa.

What planet is Malacandra?

The word Malacandra is a compound noun in Old Solar, formed with the prefix Malac and the noun handra, the latter of which means earth, land, or planet, and referring to the fourth planet from the Sun.