system
Given the following post, respond as if you're commenting on Reddit:
human
[TES] What creatures from other regions of Tamriel are as powerful as dragons

Not including the fact that dragons can fly so it wouldn't bea fair fight but in yerm of power.
gpt
Dremora lords/valkynaz, Dwemer Centurion masters, Dragon Priests, Draugr deathlords, Ice giants, nightlord vampires, vampire lords, archmages/warlocks, storm atronachs, lurkers, falmer warmongers/shadowmasters

Those are some of the most powerful creatures in Tamriel that aren't dragons. Most of them either in-game or inlore could probably put up a good fight or even beat a dragon

Outside of Tamriel, there is the Tsaesci. They live on the continent of Akavir which is where the dragons were originally from. The Tsaesci grew fond for the taste of the dragons, so they hunted them to near extinction. The few surviving dragons fled to Tamriel and that's how they came to be there.