[1.6b] Weird pedestals invoking doombringer with 2 activated

[Eerevaenshee]

-I found the 3 "weird pedestals" that should invoke the doombringer on the first level of halfing complex
-I activated the first pedestal, it brought 2 ennemies
-I activated the second it brought 1 ennemy, upon the death of this ennemy the boss was summoned
-After I killed the boss, I activated the third pedestals, it brought the worshiper but upon death I didn't get the boss again