Not being funny, but they were going to give that ult to Fiora when she was getting reworked, but canceled it because they wouldve just ulted someone squishy like the support or adc and take them away from the fight. Literally what happens in league now.
For example I was playing Irelia, the only engage on my team, got a 5man ult went in, and instantly got ulted by him. That lost us the game.
Its way too broken to isolate a chamion with someone who is a tank, deals bonus damage to a single target, burns targets after every 3 basic attacks, steals 10% of their max hp and stats and has 25% magic pen