dark arts

learning dark arts 

could possibly be difficult for humans 

the reason that few humans learned dark arts before 

is probably because it's difficult to learn dark arts 

and it probably takes time to teach dark arts 

that special operations personnel 

would probably have difficulties learning dark arts 

if they were taught dark arts 

indicates the difficulty of learning dark arts 

but in the end 

the results 

depends on who is teaching dark arts