How do i will deal damage without the .Touched ?

i made a script that makes a light ball but now i want it to deal damage then i tried to use a .Touched event, but the .Touched event is invalid to localscript and script can someone tell me how to make the ball deal damage without the .Touched event ? This is my script

Light ball (LocalScript)

local plr = game.Players.LocalPlayer
local mouse = plr:GetMouse()

function OnKeyDown(key)
	key = key:lower()
	if key == 'z' then
		x = Instance.new('Part')
		x.TopSurface = 'Smooth'
		x.CanCollide = false
	    x.BottomSurface = 'Smooth'
		x.Shape = 'Ball'
		x.Material = 'Neon'
		x.Size = Vector3.new(2.51, 2.51, 2.51)
		x.BrickColor = BrickColor.new('Deep orange')
		x.Parent = game.workspace
		pt = Instance.new('PointLight',x)
		pt.Brightness = 10000000
		pt.Range = 20
		pt.Color = Color3.new(Color3.fromRGB(255,255,0)) 
		p = Instance.new('ParticleEmitter')
		p.Parent = x
		p.Rate = 5
		p.Texture = 'rbxgameasset://Images/ParticleTest'
		p.Color = ColorSequence.new(Color3.fromRGB(255,255,0),Color3.fromRGB(255, 170, 0))
		p.VelocitySpread = 360
		p.Speed = NumberRange.new(3)
		p.Lifetime = NumberRange.new(2.1,5)
		p.Size = NumberSequence.new(1)
		p.Transparency = NumberSequence.new(0.16)
		p.LightEmission = 1
		y = Instance.new('BodyVelocity')
		y.maxForce = Vector3.new(math.huge,math.huge,math.huge)
		y.velocity = plr.Character.UpperTorso.CFrame.lookVector
		y.Parent = x
		x.CFrame = plr.Character.UpperTorso.CFrame*CFrame.new(0,0,-3)
		wait(15)
		x:remove()
	end
end
mouse.KeyDown:connect(OnKeyDown)

--Damage (Script inside the LocalScript)

function Damage(l)
	if l.Parent:FindFirstChild('Humanoid') then
		for i = 1,30
                l.Parent.Humanoid.Health = l.Parent.Humanoid.Health - 1
		end
	end

script.Parent.Touched:connect(Damage)