A medieval EP must have...

So Hard, Definitely a Nobility System, like Celebrity System + Club system

But Definitely Forging, Crafting Swords, Maces, Axes, Hammers, Armor, out of Bronze, Iron, Gold ( If your fancy). I think it would be cool if they introduced mining as well, like Gardening is so well expanding, but Mining could go far, I mean there so much mountainous rocky terrain, I'm sure Sims could just pass by a vein of Copper, Tin, Iron, Gold, even Stones, Diamonds emeralds, sapphires, rubies.
Out of Forging, We could have Sword fights, For sport or duels, instead of killing of course, you could probably take their Title, Land, Lover.
I would love Archery too. Update to Woodworking to craft bows.

Hmm I'm just thinking about the world, Great Plains and forest, However, I'm thinking about Castles, I've built castles so I don't want to See shells, I've also built gardens and Walls around my castles so I don't want to see Public space surrounding my build with Castle walls and Gardens. Basically, a 64x64 lot or bigger, surrounded by several 50x50s or smaller surrounded a City/village wall, with North, south, east, and west City gates, as one neighborhood. and then other neighborhoods surrounding it, Like to the South Docks, to the North forests and mountains, and plains to the east and west, with minor lots, more so for exploration, and quests. I feel like that's doable.

What I want tho is Realm of Magic, Magic to have a special connection to this pack. enchanting armor, weapons, objects, to make them more powerful, useful.