A Rising Shadow - The Darkness Within the Light / Part 1 - 2

And it only gets worse from here. The yearly "event" of Darkness having freedom to enter Sunlight's mind at will. It spends these times to torture her on her failures, mostly through taunts, barbs, and hurtful recollections of her failings. However, those were all just practice, this is the beginning of the real torment. Making Sunlight live out hallucinations that her mind believes are real. The grayish white ponies are called spirit ponies. They are part of Darkness's hallucinations; characters of no importance that Darkness doesn't wish to make manifest in detail. But it makes Sunlight believe that they are actual ponies. Who's Frost?