"With my powers i will remove all your memories my daughter!" Daughter still has some of her memories.
"With our powers we will kill all of the Uesugi, you guys are so weak you can't even kill one small oni" The Uesugi and even their generals survive.
"With our powers we will get the obsidian goddess, your fate is sealed" The MC gets teleported back and wakes up the next day safe and sound.
These guys are the definition of half assed, i bet they could threaten you with a curse of baldness, and you will be left with plenty of hair in your head.