During School Raze.  
Heaven and the hybrid notice the magic crisis on Equestria. When Heaven return to Ponyville, Twilight, Spike and the girls already go to Tartarus. Fearing the worst, she with Hera, Sky and more than 100000 hybrids of the Crimson Legion, go to rescue them.  
But what a surprise, when they found Twilight and the rest outside the gate of Tartarus, and now they escort them to the school. As for the school, other thing happened.  
(If you wonder, Nova have a magic reserve for Heaven, when her magic was affected)
 
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