my little pony equestria girls Fanfiction:Call of Darkness

The sirens are back, given back their seductive and alluring voices. But The question remains, who in that universe can and would grant such powerful magic by non-equestrian means? And are they all back to do bad, or could this be their redemption arc? divided the group falls apart, and loyalties are in question when one of them goes to Hell to save twilight from the fiery depths.