Fall Damage -- Roblox

-- Put in ServerScriptService

local damageHeight = 14 -- The height at which the player will start getting damaged at
local lethalHeight = 26 -- The height at which the player will get killed

game:GetService("Players").PlayerAdded:Connect(function (plr)
    plr.CharacterAdded:Connect(function (char)

        local root = char:WaitForChild("HumanoidRootPart")
        local humanoid = char:WaitForChild("Humanoid")

        if humanoid and root then

            local headHeight

            wait(3) -- Prevent the player from dying on spawn
            humanoid.FreeFalling:Connect(function (state)
                if state then
                    headHeight = root.Position.Y
                elseif not state and headHeight ~= nil then
                    pcall(function ()

                        local fell = headHeight - root.Position.Y

                        if fell >= lethalHeight then
                            humanoid.Health = 0
                        elseif fell >= damageHeight then
                            humanoid.Health = humanoid.Health - math.floor(fell)
                        end
                    end)
                end
            end)
        end
    end)
end)