How would I implement damaging into this function?

this repeats alot and isn't well optimized ( it's temporary ) and it's on a server so how would I damage

better to view source for this xd

				local character = player.Character or player.CharacterAdded:Wait()
				if not character then return end

				local torso = FindFirstChildren(character, 'Torso', 'UpperTorso', 'HumanoidRootPart', 'Head') --// custom function, so I dont have to type a bunch of ":FindFirstChild('Torso') or"
				if not torso then return end

				local dir = torso.CFrame.lookVector * 3
				local x0 = torso.Position + dir

				for _ = 1, 5 do
					local workspace = Instance_new('Model', workspace, { Name = 'Lightning' }) --// custom function (class, parent, properties)

					local prmypart

					for _ = 1, 5 do
						local lastpos = x0

						for _ = 1, 7 do
							local p0, p1 = Instance_new('Part', nil, { Transparency = 1, Anchored = 1, CanCollide = false }), Instance_new('Part', nil, { Transparency = 1, Anchored = 1, CanCollide = false })
							local a0, a1 = Instance.new 'Attachment', Instance.new 'Attachment'

							local beam = Beam:Clone()

							p0.Position = lastpos
							if not prmypart then prmypart = p0 end
							p1.Position = ((p0.Position + Vector3.new(0, 0, -(Random.new():NextNumber(3, 4.5)))) + Vector3.new(math.random(-3, 3), math.random(-3, 3), 0))
							a0.Parent = p0
							a1.Parent = p1
							
							p0.Parent = workspace
							p1.Parent = workspace
							beam.Attachment1 = a1
							beam.Attachment0 = a0
							beam.Parent = p0

							lastpos = p1.Position
						end
					end

					workspace.PrimaryPart = prmypart
					local cf = character:GetPrimaryPartCFrame()
					workspace:SetPrimaryPartCFrame((cf - cf.p) + workspace.PrimaryPart.Position)
					coroutine.wrap(Destroy)(workspace, .05) --// wait 0.05 to destroy
					wait()	
				end