the hermit who buries King Arthur was once the Bishop of Canterbury
Because he can.
MAIN: arthur, lancelot, Merlin and also Gawain
I think it represents there being no where to rest and an overturn of hierarchy, but it is for you to interpret how you want.
Sir Mordred stabs Arthur in the head during their battle in "Le Morte D' Arthur". The wound is fatal, and Arthur presumably passes away a short while later.
Bedivere last sees King Arthur when Arthur is taken by the ladies in a boat when he is mortally wounded. Bedivere had helped him by throwing his sword into the lake and helping him into the boat. Shortly after he sees Arthur off, he finds a monastery with Arthur's grave.
I would not include a detailed description of the setting or a discussion of minor characters in a summary of "Morte d'Arthur." Instead, I would focus on the main plot points, themes, and characters central to the story, such as King Arthur, the Knights of the Round Table, and the quest for the Holy Grail.
the death of arthur
Because he can.
Which battle? There are dozens of battles in the Morte d'Arthur.
Malory foreshadows Arthur's death in "Le Morte d'Arthur" with the title of the story. The title is French for "The Death of Arthur."
gawain
MAIN: arthur, lancelot, Merlin and also Gawain
That means "the death of Arthur".
Throw Excalibur back to the lady of the lake.
KingDOing Arthur pull the sword out of the rock
The part of "Morte d'Arthur" that involves an element of the supernatural is when King Arthur is taken to Avalon by the sorceress Morgan le Fay after being wounded in battle. This mystical realm is where Arthur is said to rest until he is needed again.
Tragic. informative.