I have work to do there, and I shall need protection from certain enemies.

In addition, the head and heart of certain enemies can be used.

"Why," he said, "then I would know the man who told her to be my certain enemy."

The fact that dead customers had certain bitter enemies didn't have anything to do with Jeff.

Also, certain enemies that just chased the craft in level one now have guns.

"If You suspect a certain enemy, perhaps you could supply his name."

Maia felt certain another enemy had been fought here, long ago.

Use an elemental weapon that could be more effective against certain enemies?

These can be used to easier kill certain enemies or boost one's defense against an element.

Now almost everyone has a certain "natural enemy" if I may call it that.