Hi!
Try this:
Firt find your boss character's fpe file. For example: deafult characters are installed here: "entitybankscificharacters"
You need to edit this fpe file. insert this line:
ifused = bossdoor
to the ;ai section, but before the ;spawn section
Now you need to edit the destroy script (fadecorpse.fpi by default):
you can find destroy scripts in scriptbankdestroy folder
But the best, if you make a new one:
open notepad, and insert the attched code.
;Artificial Intelligence Script
;Header
desc = Fade Out Disappear
;Triggers
:state=0:state=1
:state=1,alphafadeequal=100:decalphafade=0
:state=1,alphafadeequal=0:state=2,activateifused=1,destroy
;End of Script
Then save as fadecorpse2.fpi into scriptbankdestroy folder
Rightclick on the boss character and replace a destroy script with this new one.
Next step is to place a remote door.
Then right click on this remote door, and rename it to bossdoor
I hope this will working
EDIT:
Here is an other solution:
http://forum.thegamecreators.com/?m=forum_view&t=109868&b=23