4 Where she was wont her sprites to entertain,
wont > accustomed entertain > receive
5 The masters of her art: there was she fain
masters > (Cf. Macbeth IV i 63) fain > disposed; obliged
6 To call them all, in order, to her aid,
all, in order, to > (Or: "all, in order to") her aid > [aid her; her assistance]
7 And them conjure upon eternal pain
conjure > adjure, implore
8 To counsel her, so carefully dismayed,
carefully > anxiously