There are a crap ton of mummies in the game series. They show up as bosses in multiple games (sometimes in pairs or even in sets), and then later games started using them as regular old enemies. They're all over the place.

For someone like Thereshiri, it only makes sense that she'd try to find a way to give them a good home.
 
    

When evil spreads across the land, and darkness rises and the monsters roam. When the creatures of the night make beautiful music, and the things that go bump in the night go bump with greater enthusiasm. When the world is in peril and is in need of a hero...

These guys are, sadly, the best the world can hope for. These are the adventures of the heroes of CVRPG. They mean well, they try hard, and occasionally they do the impossible...

They actually do something heroic.