[REMOTE EVENT] Mouse Is a nil Value?

Hi, I'm having trouble figuring this out. Basically it's saying 'Mouse is a nil value' when it's being classified and sent through a Remote Event. Here are some details.

In local script in StarterPack:

local Player = game.Players.LocalPlayer
local Enabled = false
repeat wait() until Player and Player.Character
local Mouse = Player:GetMouse()

Mouse.KeyDown:Connect(function(key)
	key = key:lower()
	if not Debounce then
		Debounce = true
		if key == 'r' and not Enabled then
			Enabled = true
			ListenToGameEvent.Darkness:InvokeServer(Enum.KeyCode.R,Mouse)
			wait()
			Enabled = false
		end
	end
end)

In server script in StarterCharacterScripts:

local function Dark_Beam(Player, Key, Mouse)
	ButtonDown = true
	Charge = 0
	local bg = Instance.new('BodyGyro')
	local bp = Instance.new('BodyPosition')
	local cBG=bg:Clone()
	cBG.Name='SkillGyro'
	cBG.Parent=Player.Character:FindFirstChild('HumanoidRootPart')
	cBG.D=100
	cBG.maxTorque=Vector3.new(math.huge,math.huge,math.huge)
	local cBP=bp:Clone()
	cBP.Parent=Player.Character:FindFirstChild('HumanoidRootPart')
	cBP.Position=Player.Character.HumanoidRootPart.Position
	cBP.maxForce=Vector3.new(math.huge,math.huge,math.huge)
	local Beam = script.Beam:clone()
	Beam.Parent = Player.Character
	Beam.CFrame = Player.Character.HumanoidRootPart.CFrame*CFrame.new(0,0,-220)*CFrame.Angles(math.rad(-90),math.rad(0),math.rad(0))
	while ButtonDown == true do
		wait()
			Charge = Charge + 1
			local pos=Mouse.hit.p
end
end

The part you need to focus on is

local pos=Mouse.hit.p

It's saying Mouse is a nil value, Mouse is classified in the Local Script and is sent through the Remote Event, But it is saying Mouse is nil for some reason, I'm really confused on this and It'd be great if someone could help, thank you.