Gravity Minions, also known as gravity bots, are powerful collector minions that had the power to control and disrupt gravity. They appear to maintain the floating plains for the gravoids to thrive in. Only two are encountered in All 4 One, and of the two only one is fought.
They have only one form of attack, and that is to collect a bunch of rocks and then launch them all at the heroes. However, it very easy to dodge thanks to a weaken gravity they provide, all a player has to do is jump. Destroying a Gravity Minion would reset any effects of their gravity manipulation in the immediate area.
Their appears to larger forms of these minions, bigger than even skyscrapers. However, they do not appear to move and you never get that close to it, but it can clearly be seen beyond the edges of the plains.