How to use IsRegion3EmptyWithIgnoreList ignore list?

I'm trying to get the number of parts on top of a area "The Hill" for a KOTH game. However, I've got not a clue in how to use the ignore list, I tried using:

--What I'm trying to block:
--script.Parent or game.Workspace.start, which is where the region defined starts.
--Region defined before obviously

--Because I'm using two parts, one is the "hill" the other is setting up the region it will always return false because there is obviously one part in there, I just need to know how to use the ignore list.

print(game.Workspace:IsRegion3EmptyWithIgnoreList(Region,--[[???]]))

--If this returns true then shutdown the hill, if it returns false, continue the loop running as their is a person on the hill.

I know it's an instance but if I put in either: script.Parent or game.Workspace.start it errors: "Unable to cast value to Objects", can I only use a type such as "BasePart" or can I actually filter out a certain part?

EDIT: Solved...