Defeat Escape from Dol Guldur with core set only

On our first trial, at the final round we thought we would beat the Nazgul of Dol Guldur and win. At that time, all of us already had threat 49 because of taking three objectives. Unfortunately during the quest stage, we encountered cavern guardian which has a non-cancelable keyword Doom 1 and all of us had a threat of 50 and lost the scenario. On Second trial, we were lucky that only one king spider was encountered and we managed to play two northern tracker to avoid nasty travelling effect. (no need to travel as the locations can be explored at staging area.) Our final score is 187.