Fairy Tail 246 see’s an addition to the current Tartarus Arc as we follow Jellal as he tries to convince members of Oracion Seis to join in his battle against Zeref and currently Tartarus. The real leader of Tartarus, Mard Geer, reveals an even stronger demon called END which he’d like to activate to bring back Zeref.
Fairy Tail 245 see’s Franmalth defeated after he tries to outdo Natsu, Lucy and Happy. While his defeat is imminent, we also see Hades’ spirit tell Natsu to tell Makarov to “release the light” in order to prevent Tartarus’ true objective. On top of which Neo-Minerva appears to continue her battle against Erza while Kyouka goes to wake up their Master END.