I found a modded survival server called BeagleSMP and it is built around fantasy lore with nations and conflict. The land is full of dragons and other beasts so you can go exploring and get into trouble fast.
It uses the Ice and Fire mod so you can find dragons fight them and even tame your own. There are also custom structures and dungeons and more monsters to discover while you travel.
Players are pushed to make nations and settlements together. You can be a monarch a warrior or just run a tavern and do your own thing. The world border is kept kind of small so people stay close but it expands over time.
PVP is allowed but they do not want random killing. It is mostly meant for planned wars and big story moments and going too hard can get you punished. The server is whitelisted so you have to apply first.
