A couple of times in Nightshade you encounter these mummies

Which are fairly annoying since they have zero health. Why is that annoying? Mostly because you can punch and kick the things all day long and you can't get rid of 'em.

So what do you do?

Well, it turns out that there are two ways to deal with them.

1. You could use the Staff of Ra to fire a fireball at it. But you won't get that until late in the game. Or

2. You can jump behind it and get really close, then punch it three times to do the ol' uppercut. Turns out that the mummies are weak to an uppercut to the back of the head

In fact, it just takes one.