Towers from unknown origins have appeared in Equestria and only those who can enter it are chosen by the towers. Not even our heroes can enter it nor can Discord (Now there's a good thing about them). Twilight and her friends are doing their best to recruit those who can enter the tower to solve its purpose. While Twilight and her friends try to recruit awakened creatures, a centaur appeared in the tower and is growing his own food as the Tower Farmer.
Here is the link to my inspiration: https://rizzfables.com/series/r2311170-solo-farming-in-the-tower