ZG = {}
ZG.VAR = {}

-- In this part of the script, I want to store some creatures as variables without collision, so this is how I do it:

function ZG.VAR.SetUpCreatures_Dragon(pUnit)

    -- Get the ID of the instance
    local id = pUnit:GetInstanceID()
    -- If the ID Is nil (not in a instance) then set it to 1
    if id == nil then id = 1 end
    -- Set up our table to be used
    ZG[id] = ZG[id] or {VAR={}}

    -- Now we can create variables using this table as the primary key,
    -- e.g, instead of local leader = pUnit:Spawn... We do:
    ZG[id].VAR.leader = pUnit:SpawnCreature(36544, -11062, -2306, 145.9, 1.290404, 35, 0, 50429) -- Leader
    ZG[id].VAR.addA = pUnit:SpawnCreature(4052, -11075, -2307, 145, 1.058709, 35, 0, 45212)
    ZG[id].VAR.addB = pUnit:SpawnCreature(4052, -11066, -2311, 145.9, 1.184373, 35, 0, 45212)
    ZG[id].VAR.addC = pUnit:SpawnCreature(4052, -11057, -2314, 147.3, 1.549583, 35, 0, 45212)
    ZG[id].VAR.addD = pUnit:SpawnCreature(4052, -11049, -2311, 146.3, 2, 35, 0, 45212)

end

-- In this function I want to use the creatures I defined earlier, so I do:

function ZG.VAR.WhileNoPlayer_DoVisual(pUnit)
    -- Get the instance and set up the table again just in case
    local id = pUnit:GetInstanceID()
    if id == nil then id = 1 end
    ZG[id] = ZG[id] or {VAR={}}

    -- Retrieve our variables stored and use them
    ZG[id].VAR.leader:ChannelSpell(48185, pUnit)
    ZG[id].VAR.addA:ChannelSpell(49128, ZG[id].VAR.leader)
    ZG[id].VAR.addB:ChannelSpell(49128, ZG[id].VAR.leader)
    ZG[id].VAR.addC:ChannelSpell(49128, ZG[id].VAR.leader)
    ZG[id].VAR.addD:ChannelSpell(49128, ZG[id].VAR.leader)

    -- If we wanted to not write this out every time, we could do:
    local leader = ZG[id].VAR.leader

    leader:CastSpell(11) -- this is collision proof as it was stored in the table
end