The season 4 premiere added a crag-odile (looks like a crocodile with a mineral warrior template) plunderseeds (black, thorny vines that keep spreading from everfree forest, feeding on magic and as the result disrupting spellcasting - they can also sprout mouths, that breath sleeping gas) and a new weather anomaly - black, spiky stormclouds that shoot lightning at pegasi who try to clear them away.