XIETIAN
Harem will now include fire sorrow. I think the demon army will want earth to monopolize the during individuals to join their faction when they are strong enough. the other factions will fight with them over earth. The system wants Zemin to kick all factions off of earth because atleast noone under Zemin will join and Zemin will make his own faction!
I'm not 100% sure about this one but I think reverting higher existences should be mostly impossibile since most of them would die of old age the moment they reversed.
MilkedUp:I think that in the future Bai will turn members of other factions back to human to join his faction. Fire sorrow hasn't seen Zemin change any humans yet but if she keeps watching I'm sure he'll turn alot of zombies back human soon