The last time we see the second of these figures is with a black hood on  a barge.
The last time we see the second of these figures is with a black hood on  a barge. That figure of this name saved Sir Lamorak when she whisked  Sir Tristram to Annowre's realm, whom Tristram promptly killed. King  Arthur is able to defeat the invincible knight Accolon due to that figure of  this name causing Accolon to drop his scabbard and sword. In addition  to the second one of these figures that was trapped beneath a rock in  Cornwall, this name also graces a woman that waltzes into court and  demands that (*) Balin loses his head, but in response this woman gets her  head cut off by Balin. Lancelot was said to be raised by the second one, which  is why he shares one of his descriptors with her. For 10 points, give this name  of two mysterious women, one of whom gave King Arthur the Excalibur.
The last time we see the second of these figures is with a black hood on  a barge.
Lady of the Lake [accept Nimue or Damosel of the Lake]