Track the activation of a single special object, without mapping it with a number or giving it a fictitious number such as -1.

[Dragonlich8]

Considering that CAGE_SUCCUBE_TRAPPED is a correctly configured as SPECIAL type object. Whereas the CAGE object is a normal object.
I find it would be very useful to be able to use a procedure of this type instead of the second version.
With this method, in addition to immediacy, there is the advantage that UNEARTH shows the correct icon for the object, making it much easier to read the map.

STEP1
IF(PLAYER0,CAGE_SUCCUBE_TRAPPED > 0)
ADD_OBJECT_TO_LEVEL(CAGE,LAST_EVENT,-1)
ADD_CREATURE_TO_LEVEL(PLAYER0,SUCCUBE,LAST_EVENT,1,10,500,INITIALIZE)
SET_FLAG(PLAYER0,FLAG5,1)
ENDIF
no more step needed!

Old procedure.

STEP1
Create a AP 29 to place the object

STEP2
ADD_OBJECT_TO_LEVEL(CAGE_SUCCUBE_TRAPPED ,29,8)

STEP3
IF(PLAYER0,BOX8_ACTIVATED > 0)
ADD_OBJECT_TO_LEVEL(CAGE,LAST_EVENT,-1)
ADD_CREATURE_TO_LEVEL(PLAYER0,SUCCUBE,LAST_EVENT,1,10,500,INITIALIZE)
SET_FLAG(PLAYER0,FLAG5,1)
ENDIF

[PieterVdc]

if it's niche enough that I don't think it's worth adding to dkscipt when lua already does fine
haven't tested it but think this code should do
if not, please check the logfile for relevant errors, if you can't figure it out ask me

function CageSuccubeActivated(eventData,triggerData)
    AddObjectToLevel("CAGE", eventData.Thing.pos, -1)
    AddCreatureToLevel(PLAYER0, "SUCCUBE", eventData.Thing.pos, 1, 10, 500, "INITIALIZE")
    PLAYER0.FLAG5 = 1
end


function OnGameStart()
    local trig = RegisterSpecialActivatedEvent(CageSuccubeActivated)
    trig.triggerData.model = "CAGE_SUCCUBE_TRAPPED"
    TriggerAddCondition(trig, function(eventData,triggerData) return eventData.Thing.model == triggerData.model end)
end

[PieterVdc]

@Dragonlich8 closing this one but if there's an issue with the lua above feel free to ask