The right moment to act

Dear Princess Celestia:
~May all the Monsters come and get you~
~Hunt you down just like they do~
~in your Nightmares~
~I won't feel any sympathy for you~
~Not even once~

~And may all the creatures of the dark~
~Keep you awake at night~
~so that you can't sleep~
~And I will dream a happy dream~
~of a place where I am free~
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~But when that time comes I'll just wait . . .I'll wait when your day of demise comes~