From 1d4chan

The elf goddess of dark magic of the Cytharai, while Hoeth is all about learning and wisdom, Hekarti is willing to give her worshippers pure power, at a price. No gift goes for free, after all.

She is depicted as having numerous arms holding various objects. Kinda like a mystic elf hindu deity.

Morathi was revealed to be her avatar in The End Times.

Considering her name, being a goddess of the underworld and her focus on magic and mysteries, she is clearly inspired by the Greek Goddess Hecate who shares these similar traits.

The High Elves and their gods of Warhammer Fantasy
High elf icon.jpg Characters: Eltharion - Everqueen - Teclis - Tyrion - Prince Imrik - Alith Anar High elf icon.jpg
Cadai: Asuryan - Hoeth - Isha - Kurnous - Lileath - Loec - Mathlann - Vaul
Cytharai: Addaioth - Anath Raema - Atharti - Drakira
Eldrazor - Ellinill - Ereth Khial - Estreuth - Hekarti
Hukon - Khaine - Ladrielle - Morai-Heg - Nethu
Events: The War of the Beard - The invasion of Naggaroth
Misc: Ulthuan - The Vortex - Waystone - Widowmaker
Appearances: Blood Bowl - Dreadfleet - Mordheim - Warhammer Fantasy Battle