I'm trying to make a part so when you're on top of or above the part, you slowly take damage no matter how far up you are, as long as you're above the part. I'm not sure how to do this and would prefer this way instead of making an invisible part over the part. Is there any way?
You could use Ray's by sending a ray directly below the player, then find which part it is using
http://wiki.roblox.com/index.php?title=API:Class/Workspace/FindPartOnRay
For more about rays, here's the wiki page, that has everything you need to know about rays