I am starting a game taking place in the middle ages. With a huge war between human and beast. I need some ideas so if you can just post some ideas for me to use in this game. Thank you.

That's not how this forum works. You should tell us about your game first, say what you are trying to achieve and how well you think you are doing it. Anyone can blurt out a bunch of ideas, but they are useless without knowing what you actually WANT from your game.

Also telling us of your programming experience seems to help. Because not everyone is capable of adding certain features to a game.

Though as dogcity wrote your being vague. "a huge war between human and beast" doesn't tell much. I understand the human part, but what are these medieval beasts that the humans are fighting?

All you said is in essence:

-middle ages
-war between humans and "beasts"

Just so I don't come off as mean I will ask questions.

What is the Genre of this game? This is the most important question. Without knowing this, the ideas presented could not be for your game.

A medieval game where humans fight "beasts" has been done in RTS form, like the warcraft trilogy.