Deanna is also known as: Lady of the Hunt, Lady of the Maidens, Mistress of the Night, Keeper of the Moon, and "the Huntress and Protector of the Young". She is one of the main deities present in Erilea, being the original Goddess of the Moon.
The books have some controversy to whether she is in fact Mab. It was mentioned in Heir of Fire that Mab was proclaimed a goddess, Deanna. However she may have just become the image of the goddess. It is certain however, that the Goddess that appeared in Empire of Storms was in fact Deanna.
Deanna is often depicted crowned with a star and armed with a bow and a golden arrow.
While Deanna possessed Aelin, it was shown that her eyes where a different colour to Aelin's, as mentioned by Rowan:
"And her eyes...
Turquoise burned bright... around a core of silver. No hint of gold to be found."
Deanna has always been the Goddess of the Moon, and the eternal rival and sister of Mala Fire-Bringer, although Aelin has stated that they probably have been working together the whole time. Both goddesses have watched over Aelin throughout her whole life.
Throne of Glass
During the Yulemas celebration, the young girl representing Deanna gives Celeana her gift (a golden arrow).
Empire of Storms
During the fifth book, Deanna appeared in Skulls Bay, through Aelin.
While Aelin was delving deep into her well of magic, the third wyrdkey inside the Amulet of Orynth around her neck merged with her magic. Deanna happened to be waiting in the temporary wyrdgate at that moment, and possessed Aelin. She, in Aelin's body, proceeded to uncover a deeper well of power granted by Mala Fire-Bringer, as her blood flowed in Aelin's veins.
Deanna converted all Aelin's standard Fire Magic into Moon-Fire. It was mentioned as being the cold white light stolen from the stars. Rowan also noted that the fire would be so cold it burned.
The goddess had decided that instead of obliterating Morath's forces, she would destroy Rolfe's fleet and the inhabitants of Skulls' Bay. Rowan's inteference in Deanna's path forced Aelin to take back her body, and she quickly diverted her power, obliterating most of Morath's fleet.
From her actions, it is presumed that she had not been watching Aelin her whole life, but like a spider, she had been hunting her, waiting for the opportunity that Aelin 'gave' her at Skulls Bay to possess both Aelin and her power.
She, along with the other gods have been mentioned to possess the following abilities:
- Omnipresence - She, along with the other gods are able to spread their beings to vast distances, and be present in multiple areas in the world at once.
- Immortality - She is a Goddess, and a being of higher existence, to whom time is fluid. It was also mentioned in Empire of Storms that Deanna was immortal, so it's assumed that all the gods are immortal, and cannot be killed.
 - Sarah J Maas's Pintrest board - pin of Deanna <https://au.pinterest.com/pin/246853623302949640/>