Waterfall_13
Do you remember?))))
Necropolis
In Heroes of Might and Magic II, Mummies were added as an alternative upgrade.
Rotting Zombies became the third-level upgrade for Tier 2 dwellings.
That is, Plague Zombies upgrade into Rotting Zombies (they have higher stats but cost more).
Mummies upgrade into Royal Mummies, which are the third-level upgrade for Tier 2 dwellings.
Here, it's clear what and how it works. 
The special thing about Mummies is that they have high initiative (14) and medium speed, and they apply the "Gloom" debuff, which reduces attack and defense by 2.
But at the same time, they are very fragile, with only 10 hit points.
Royal Mummies have slightly higher stats: +1 initiative, +1 speed, +1 minimum and maximum damage, and 15 hit points (but they cost more).