Lady of the Lake

The Lady of the Lake is the truly unimaginative Goddess of the Bretonnian knight army in Warhammer Fantasy. While everyone in the army is ripped off pretty much from Arthurian legend (except adding a factor of grimdark to the knights and peasants times ten), the Lady needs no pointing out who they are trying to copy here; heck it is not surprising to hear newbies getting confused as why the Lady jumped over to the Warhammer world. The Lady is the Goddess of all Bretonnia, and represents nobility, honour, courage and killing stuff. Indeed, she may seem all serene and everything but her most dedicated worshipers are warriors after all. She secretly loves the sight of blood.

She had the ability to grant chosen knights a portion of her might when they drink from her funky chalice. While they are awesome in the fluff with all these great powers, in practice on the field they are just a bit more of an elite cavalry unit able to strike at magical beings.

Many sources claim that the Lady is a lie and that it is actually Ariel of the Wood Elves who is the true power behind her, using the Bretonnians as a buffer to protect her people. Neither side has been proven false so far, but considering how grimdark the second option is, it will probably be that one Wood Elves fluff now confirms The Lady as a separate entity called Corrigyn, The Daughter of Mist. Upon the Silverspire she resides (which is probably Knights go to... "partake" of her gifts. Imagine if every White Knight/Nice Guys actually got laid for their efforts once in a while.. Oh wait, Grail Knights.

She could also be Isha in a human aspect No. That's Ariel.