Yes, that will not work.
Using the following action in your "Portal Trigger":
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Trigger - Run Portal Activation <gen> (checking conditions)
means that you want to run all actions of "Portal Activation" trigger as part of the "Portal Trigger", but only if "Portal Activation" trigger's condition are satisfied. In essence, you can think of it as if you created following big trigger by merging your three triggers:
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Portal Trigger
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Events
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Unit - A unit owned by Player 7 (Green) Is issued an order targeting an object
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Conditions
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(Owner of (Triggering unit)) Equal to Player 7 (Green)
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Actions
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Trigger - Turn off Portal Trigger <gen>
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If (All Conditions are True) then do (Then Actions) else do (Else Actions)
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If - Conditions
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(Triggering unit) Equal to Terrordar_Dreadlord
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(Ability being cast) Equal to Portal (Terrordar)
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Then - Actions
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Trigger - Turn off Portal Activation <gen>
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If (All Conditions are True) then do (Then Actions) else do (Else Actions)
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If - Conditions
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(Casting unit) Equal to Terrordar_Dreadlord
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(Ability being cast) Equal to Portal (Terrordar)
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Then - Actions
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Trigger - Turn off Portal Spell <gen>
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Set VariableSet Point01 = (Position of Portal 3683 <gen>)
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Set VariableSet Point02 = (Position of Portal 3682 <gen>)
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Unit - Unhide Portal 3683 <gen>
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Unit - Make Portal 3683 <gen> Invulnerable
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Unit - Grant shared vision of Portal 3683 <gen> to Player 7 (Green)
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Unit - Add Waygate ability to Portal 3683 <gen>
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Neutral Building - Set Portal 3683 <gen> destination to (Center of Portal From <gen>)
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Neutral Building - Enable Portal 3683 <gen>
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Unit - Add a 15.00 second Generic expiration timer to Portal 3683 <gen>
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Unit - Unhide Portal 3682 <gen>
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Unit - Make Portal 3682 <gen> Invulnerable
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Unit - Grant shared vision of Portal 3682 <gen> to Player 7 (Green)
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Unit - Add Waygate ability to Portal 3682 <gen>
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Neutral Building - Set Portal 3682 <gen> destination to (Center of PortalRegion <gen>)
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Neutral Building - Enable Portal 3682 <gen>
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Unit - Add a 15.00 second Generic expiration timer to Portal 3682 <gen>
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Else - Actions
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Else - Actions
From this, the issue as to why it does not work should be more apparent: There is no (Casting unit) and there is no (Ability being cast), because it is a "Unit issued an order" event, not a "Unit begins/starts casting an ability" event.
First of all, in your "Portal Trigger" trigger there is no need for the condition "Triggering unit belongs to Player 7", as the event runs only for Player 7.
Second of all, the event "Is issued an order targeting
an object" runs when player targets any object, not only units. So for example it will run when player 7 makes Peon target a tree, or makes Hero target a crate/barrel, or any other destructible. To ensure that this starts only when Player 7 targets an actual unit, use condition like
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(Target unit of issued order) Not equal to No unit
Next, if you want to disable trigger itself once it executes, just use
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Trigger - Turn off (This trigger)
as that is easier to read, less error-prone and also easier for the rest of us to understand what you are trying to do.
Next, your "Portal Activation" trigger is completely useless in what you are trying to achieve. As described in the picture in
Casting Events Guide guide, when unit starts casting something, it goes through multiple cast events. Use "Begins casting an ability" when you want to perform some additional checks before unit actually starts casting the spell (as this runs before spell's mana cost is applied on the unit and before spell's cooldown starts). As you don't really do anything in that trigger, it serves no purpose.
Also, if Player 7 has more units than just "Terrordar_Dreadlord" unit, then make sure that the issued unit is actually Terrordar_Dreadlord before you turn triggers off. Imagine that Player 7 has for example a Ghoul unit. That Ghoul unit is issued an order to attack some enemy. This will run your "Portal Trigger", which promptly turns itself off. When the time comes when Terrordar_Dreadlord is issued an order, then nothing happens since the "Portal Trigger" has been turned off earlier by Ghoul.
My guess is that you want to order Terrordar_Dreadlord to cast Portal spell the first time Terrordar_Dreadlord is issued an order targeting a unit? If so, the following could work:
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Terrordar Issued an Order
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Events
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Unit - A unit owned by Player 7 (Green) Is issued an order targeting an object
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Conditions
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(Target unit of issued order) Not equal to No unit
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(Triggering unit) Equal to Terrordar_Dreadlord
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Actions
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Trigger - Turn off (This trigger)
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Unit - Order Terrordar_Dreadlord to Night Elf Keeper Of The Grove - Tranquility.
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Portal Spell
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Events
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Unit - A unit Starts the effect of an ability
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Conditions
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(Triggering unit) Equal to Terrordar_Dreadlord
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(Ability being cast) Equal to Portal (Terrordar)
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Actions
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Trigger - Turn off (This trigger)
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-------- --------------------------------------------------------------- --------
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Set VariableSet whichPortal = Portal 0003 <gen>
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Set VariableSet targetTeleportLocation = (Position of Portal 0004 <gen>)
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Trigger - Run Activate Portal <gen> (checking conditions)
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-------- --------------------------------------------------------------- --------
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Set VariableSet whichPortal = Portal 0004 <gen>
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Set VariableSet targetTeleportLocation = (Position of Portal 0003 <gen>)
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Trigger - Run Activate Portal <gen> (checking conditions)
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Activate Portal
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Events
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Conditions
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Actions
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Unit - Unhide whichPortal
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Unit - Make whichPortal Invulnerable
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Unit - Grant shared vision of whichPortal to Player 7 (Green)
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Unit - Add Waygate ability to whichPortal
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Neutral Building - Set whichPortal destination to targetTeleportLocation
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Neutral Building - Enable whichPortal
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Unit - Add a 15.00 second Generic expiration timer to whichPortal
I assume that your "Portal (Terrordar)" spell is based off Tranquility spell, hence why in "Terrordar Issued an Order" trigger I order the unit to use Tranquility. If you based your Portal spell off different spell, then just update it to correct order.
