Question about RemoteEvents from Script to Server?

Hello,

I have a Script that's held by a Part, attached to a part inside the Player, when it touches an opposing player, it should both do damage, and send a RemoteEvent. It does the damage, but when it sends the RemoteEvent, its not receiving the request correctly. I think I'm getting the syntax wrong here.

Question: Is FireClient () and OnServerEvent:Connect(function() the correct things to be using here to send the request from a Script, not a LocalScript, to another script on the Server?

Abbreviated Script inside the Part:

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local EXPEvent = RR:WaitForChild("EXPEvent")

local character = script.Parent.Parent
local player = game.Players:GetPlayerFromCharacter(character.Parent.Parent.Parent)


if player then
    local damage = 100
        local x = script.Parent.Parent.Weapon
        x.Touched:Connect(function(x)
            if x.Parent:FindFirstChild("Humanoid") and x.Parent.Name ~= player.Name then
                x.Parent.Humanoid:TakeDamage(damage)
                EXPEvent:FireClient(player) -- Sends the RemoteEvent Request

            end
        end)        
end

and then the Script inside ServerScriptStorage:

EXPEvent.OnServerEvent:Connect(function(player)
    wait(2)
        player.leaderstats.Experience.Value = player.leaderstats.Experience.Value + 10 
end)

I'm not getting any errors, except when I tried changing the OnServerEvent to OnClientEvent and it told me I could only do that from client scripts.

Thanks!