How to make a "Pain Zone"?

Help and Feedback Scripting Support
7

Here’s a somewhat short example to get you started, it’ll require a physical part instance to represent the damaging area.

local Game = game
local Workspace = workspace
local Players = Game:GetService("Players")
local RunService = Game:GetService("RunService")
local Part = Workspace.Part --Harmful area.

local Time = 0

local function OnHeartbeat(Delta)
	if Time > 10 then Time = 0 else Time += Delta return end --Frequency of 'ticks', currently once per 10 seconds.
	local Models = {}
	local Parts = Workspace:GetPartsInPart(Part)
	for _, Part in ipairs(Parts) do
		local Model = Part:FindFirstAncestorOfClass("Model")
		if (not Model) or Models[Model] then continue end
		Models[Model] = true
		local Humanoid = Model:FindFirstChildOfClass("Humanoid")
		if (not Humanoid) or Humanoid.Health <= 0 then continue end
		local Player = Players:GetPlayerFromCharacter(Model)
		if not Player then continue end
		Humanoid:TakeDamage(10) --Damage per 'tick', currently 10.
	end
end

RunService.Heartbeat:Connect(OnHeartbeat)