Another basic undead variant, mummies, in general, are simply corpses of humans or animals that are preserved and kept from further decomposition. This can occur naturally through extremely cold, or from extremely dry environments, however is often done intentionally to preserve the body, most commonly associated with Egyptian mummies, as they were the first to develop a process of mummification.
Because of this association with Egyptians, mummies in fiction can be seen with other Egyptian, and more specifically Pharaoh paraphernalia, such as a Nemes Crown, Ankhs, or the Crook and Flail, of course, their iconic linen wrappings are also included.
Much like zombies, mummies are often shuffling undead, their limbs occasionally bent and twisted in unnatural ways. Unlike zombies though, mummies attacks do not often cause the sufferer to become a zombie but do often spread a mummies curse. For example, in Dungeons and Dragons, a mummy can inflict Mummy Rot, which if left untreated, will cause the victim to turn to ash. Mummies have one more strong difference to that of zombies, and that is their reliance on magic. While zombies have often been given pseudoscientific explanations for their existence in media, mummies have always being brought to life through a curse or magic, and as such also can rely on magic abilities. Interestingly, the idea of romance is often brought up with zombies in media as well, with many novels written of mummies being sexual partners to archaeologists? Gross but fun fact.
Their Egyptian connections dictate mummies always be ancient in some way, therefore their spook is increased. The wearing of traditional Egyptian items like the Nemes crown gives their horror a royal feel.
Because of their magic abilities, mummies can be quite powerful. Their slow movement means they aren’t the most dangerous, but their long-distance abilities to cause fear, disease, or to control others mean they are not to be overlooked.
Mummies undergo natural changes to their bodies through the mummification process, however are often given supernatural features such as glowing eyes.
The name mummy is obviously very close to mommy, or if you are British, just the exact same as mother. Because of this, their name is not very intimidating, however, they are well known, and do hold a sense of horror, even if dampened by their maternal similarities.
The first mainstream instance of a mummy used for horror, where he is able to control the minds of those he encounters, as well as cause their deaths.
One of the most popular instances of an undead mummy, and is a remake of the 1932 horror. He gains power over sand, and other powerful abilities.
Dungeons and Dragons Mummy - https://roll20.net/compendium/dnd5e/Mummy#content
Video on Egyptian Mummy Process - https://www.youtube.com/watch?v=-MQ5dL9cQX0
The Mummy Wiki Page - https://en.wikipedia.org/wiki/Mummy_(undead)