[Xrystal]

You're almost there but but not quite got it right.

Give this slight change a go

local function lootReceived(eventCode,receivedBy, itemName, quantity, itemSound, lootType, self)
  Loot:SetText("You looted stuff!!!")
  d(itemName)
end
  
local function RegisterLootEvent(eventcode, name)
  if (name == "PileOMobs") then
    EVENT_MANAGER:RegisterForEvent("PileOMobs",EVENT_LOOT_RECEIVED, lootReceived)
    Loot:SetText("Loot event registered.")   --- Note: Message probably won't appear at this stage
  end
end
 
function PileOMobsInit(self)
  self:RegisterForEvent("PileOMobs", EVENT_ADD_ON_LOADED, RegisterLootEvent)
end