Both Uses

oblivion
in
Anne Of Green Gables
(Auto-generated)

I assure you once for all that I did not mean to intoxicate Diana and henceforth I shall cover the past with the mantle of oblivion.'†
p. 142.2 *

oblivion = a state of being completely gone from memory, existence, or awareness
She determined to "shroud her feelings in deepest oblivion," and it may be stated here and now that she did it, so successfully that Gilbert, who possibly was not quite so indifferent as he seemed, could not console himself with any belief that Anne felt his retaliatory scorn.†
p. 239.6

Definitions:

(1) (oblivion)
state of complete loss—being totally forgotten, wiped out, or lost to awareness of what is going on
(2) (meaning too rare to warrant focus)