baron type guy in ARAM(possible mode)

I know its been posted before and perhaps its not the right fit for ARAM but I wanted to throw this idea out there, so my thinking was having a spot at both bases just off to the left/right side of the starting area where a baron type mob could spawn(perhaps he wouldn't be that hard to kill though as players can't heal) some teams on ARAM tend to be very imbalanced where one team has lots of tanks and the other is all ADC's my thinking was if certain conditions are met like both turrets are down and the inhib or something to that extent the boss monster shows up for the losing team, which would give them a team buff perhaps get them back in the fight(which might let the enemy team get their boss mob to spawn so they can kill it for their buff) or the enemy team might get the steal allowing them to finish it off more quickly, at the very least it might make a cool mode for ARAM.