New Champ Idea: Fel'Serah: The Soul's Scream

Fel'Serah's basic idea around his kit would be to switch from melee assassin to medium range Mage with the use of an ultimate, similar to Nidalee's ultimate. I'm his assassin form, he would be able to grapple onto his targets with his Q, knock them up with his E, and deal solid burst damage with his W that is a standard auto attack reset. In his Mage form, he would deal higher damage but be very reliant on skill shots like Ahri or Xerath, his Q would be a skill shot that deals damage and creates a circle at the end of its path that burns enemies inside the circle, his W would be like a Jhin trap or a Teemo shroom, in that when enemies walk over it, they take damage and are knocked up, allowing easy hits and burns with his Q. His E would be a skill that is Point-And-Click, it deals decent damage on its own, but it would deal massive damage to all knocked up targets. His E will look like he's raining fire down on his enemies, almost like he's slamming then to the ground with telekinesis. I'm open for discussion and tweaks to the idea