[thaumasiotes]

The sword in the stone really isn't the right story here; you want Arthur receiving Excalibur from the Lady of the Lake.

[ryandrake]

...her arm clad in the purest shimmering silmite held aloft Excalibur from the bosom of the water...

(Couldn’t resist)

[gumby]

Honestly as I kid I thought that she would be clad in slime -- but I still would eagerly have grabbed the cutlery.

[qohen]

s/silmite/samite

Per Wikipedia[0]:

Samite was a luxurious and heavy silk fabric worn in the Middle Ages, of a twill-type weave, often including gold or silver thread.

[0] https://en.wikipedia.org/wiki/Samite