Workspace.Dummy.Controller.Attack:12: Expected identifier when parsing expression, got ')'?

The error is very simple: On line 12, you added an extra closing bracket ) without closing it All you have to do is remove the extra closing bracket on line 12. Also, you're also missing an end)

Let me know if you have more issues!

##~JesseSong

Fixed Code:

local attackCooldown = 1
local attackWindup = 0.5
local attackRange = 3
local attackDamage = 20

local char = script.Parent.Parent
local hum = char:WaitForChild("humanoid")
local originalWalkSpeed = hum.WalkSpeed

local canAttack = true

script.Parent.AttackRemote.Event:Connect(function(plrRoot)

if not canAttack then return end
canAttack = false

hun.Walkspeed = 0.1

local anim = Instance.new("Animation")
anim.AnimationId = "rbxassetid://7209529782"
local playAnim = hum:LoadAnimation(anim)
plrRoot:Play()

wait(attackWindup)
local newDistance = (char.HumanoidRootPart.Position - -plrRoot.Position).magnitude
if newDistance <= attackRange + 5 then 

	if plrRoot.parent.Player.isBlocking.Value == true then
		attackDamage *= 0.5
	end
	plrRoot.Parent.Humanoid:takeDamage(attackDamage)

	wait(attackCooldown)
	hum.WalkSpeen = orininalWalkSpeed
	canAttack = true

end
end)