This tutorial will show you how to create the triggers necessary to open a locked door, like in the Dungeon missions.

First, create the map. All you need to do to test these triggers, is put a Paladin down, the item ‘Ghost Key’ next to him, place a gate, and create a region just in front of the gate.

It should look like this:

Event:
Unit – A unit enters Region001 [gen]
– If any unit enters the region next to the gate

Condition:
((Triggering unit) Equal to Paladin 0000 [gen]) and ((Item carried by Paladin 0000 [gen] of type Ghost Key) Equal to Ghost Key 0001 [gen])
– as long as that unit is the hero (selected), and he has the Ghost Key (also selected)

Action:
Destructible Doodad – Open Demon Gate (Diagonal 1) 0000 [gen]
– Open the gate (selected)

This should look like so in the Editor:

Another way to do this, is to use the If/Then/Else trigger. Like so:

Event:
Unit – A unit enters Region001 [gen]
– If any unit enters the region next to the gate

Condition:
No Conditions

Action:
If (((Triggering unit) Equal to Paladin 0000 [gen]) and ((Item carried by Paladin 0000 [gen] of type Ghost Key) Equal to Ghost Key 0001 [gen])) Then do (Destructible Doodad – Open Demon Gate (Diagonal 1) 0000 [gen]) Else do (Do Nothing)
– This creates just the same effect as before, however, the condition and action are now both in a single action.

This should work, if not, try fiddling about with the unit animations instead of using the ‘Open Door trigger’.