Warlock – “Expansion” [4th campaign, 2nd mission]

I've been searching for that damn Ash's Tear for 3 months (in-game). I've searched half the map already. All the towns are fully built. I have 500,000 gold and 300 of each resource. But I still can't find the tear... Can anyone suggest a code to add it, like the one for adding skills? I just want to finish the mission by any means necessary...