Spike is her number-one assistant and that will never change. Even in her becoming a greater princess he has not failed in that role. Isn't it odd how a dragon can compensate for a castle? Twilight discovers his secret... and must save him from it.
When Twilight is thrust into a world of horrifying abominations, terrors she can't begin to imagine, and a never-ending fear of what's behind that corner, she's forced to survive in a world which wants nothing more than to see her die.