Question

what did the knight ask the pilgrim shadow​

Answer 1

$\huge\mathrm{\underline{AnSwEr}}$

A ''shadow'' (possibly Death himself) appears to him and the knight asks him where he can find Eldorado.

Answer 2

Explanation:

the knight's situation has become more serious. ''His strength failed him at length'' implies that he has died or is very near death, never having attained his goal. A ''shadow'' (possibly Death himself) appears to him and the knight asks him where he can find Eldorado.