How do I read a variable from a LocalScript in a Server Script?

I'm trying to access a variable from a localscript inside of a tool in a script in ServerScriptService, and I don't understand how to do it. This is my latest method of doing it:

LocalScript:

local gun = script.parent
local player = game.Players.LocalPlayer
local clipSize = 15
local maxClipSize = 15
local reloadTime = 2
local damage = 10
--Keys
local UserInputService = game:GetService("UserInputService")
local rKey = Enum.KeyCode.R
-- Obeject Sound Varibles
local gun_sound = gun.Handle['Gun Shot']
local empty_sound = gun.Handle.clip_empty
local reload_sound = gun.Handle.Reload 

gun.Equipped:Connect(function(mouse)
	
	player.PlayerGui.ScreenGui.Ammo.Visible = true
	--Firing the gun
	mouse.Button1Down:Connect(function()
		if clipSize >= 1 then
			game.ReplicatedStorage.DamageEvent:FireServer(damage)--This is the line to fire the server script
			game.ReplicatedStorage.RayCastEvent:FireServer(script.Parent.Barrel.Position, mouse.Hit.Position)
			gun_sound:Play()
			clipSize -= 1
		else --Reloading the gun automatically after clip is empty
			empty_sound:Play()
			wait(0.01)
			reload_sound:Play()
			wait(reloadTime)
			clipSize = maxClipSize
		end
	end)
	
	local function IsRKeyPressed()
		return UserInputService:IsKeyDown(rKey)
	end
	--Reload with the "R" key
	local function Input(input, gameProccessedEvent)
		if IsRKeyPressed()then
			reload_sound:Play()
			wait(reloadTime)
			clipSize = maxClipSize
		end
	end
	UserInputService.InputBegan:Connect(Input)
end)

ServerScript:

game.ReplicatedStorage.RayCastEvent.OnServerEvent:Connect(function(Player, FromP, ToP)
	local RayCast = Ray.new(FromP, (ToP-FromP).unit * 100)
	local Part, Position = game.Workspace:FindPartOnRay(RayCast, Player.Character, false, true)
	--Applying the variable
	if Part then
		local Hum = Part.Parent:FindFirstChild("Humanoid")
		if Hum then
			print(_G.damageVariable)
			
			Hum:TakeDamage(_G.damageVariable)
		end
	end
	
	local bulletBeam = Instance.new("Part")
	bulletBeam.Parent = game.Workspace
	bulletBeam.CanCollide = false
	bulletBeam.Anchored = true
	local Dist = (ToP-FromP).magnitude
	bulletBeam.CFrame = CFrame.new(FromP, Position) * CFrame.new(0, 0, -Dist / 2)
	bulletBeam.Size = Vector3.new(0.1, 0.1, Dist)
	game.Debris:AddItem(bulletBeam, 0.2)
end)
--Receiving the variable
game.ReplicatedStorage.DamageEvent.OnServerEvent:Connect(function(Player, damage)
	_G.damageVariable = damage
end)

Just make a new variable in the server, and get the information from the server.

Make a remote event, pass the variable over to the server by doing the following

local Variable = script.Parent.Parent.TextLabel -- use text for instance, we don't wanna pass .Text for the text label because it has to update every time so we do it in the :FireServer()

game.ReplicatedStorage.RemoteEvent:FireServer(player, Variable.Text)

local ^

game.ReplicatedStorage.OnServerEvent:Connect(function(player, Variable)
Variable = "Hello! How are you today"
wait(3)
Variable = ""
end)

What this does is it will auto pass variable and we don't need to do Variable.Text because it's simply passed through the FireServer, Variable.Text so we just need Variable = "Text Here!"

I created a separate ModuleScript called "Damages" containing:

local DamageModule = {}
	DamageModule.handgunDamage = 10
return DamageModule

And made the Serverscript require this to see if the player has a tool, then set's a local damage variable based on whatever the tool's name is:

	--Gun variables
	local gunType = Player.Character:FindFirstChildOfClass("Tool")
	local name = gunType.Name
	--Damage variables
	local damagesScript = require(script.Parent.Damages)
	local damage
	
	if Part then
		--Setting the gun type for the damage of it
		if name == "Handgun" then
			damage = damagesScript.handgunDamage
		--Will have elseif here once more guns are added
		end
		--Making the hit entity take damage
		_G.Hum = Part.Parent:FindFirstChild("Humanoid")
		if _G.Hum then
			local localHum = _G.Hum
			localHum:TakeDamage(damage)
		end
	end