Get a "map" to buried loot. The horde of a warrior guild of legend. Hire thugs and peasants to dig a mine to it. You get a portal, put it in the deepest part of the mine, use it to check up on their progress from time to time. There is no loot. You have an enchanter make a bunch of bullshit items look truly amazing, do it on the cheap if you want. Load the tunnel with explosives, or have it near a magma vein. Trap. invite party members...all of them, to the tunnel after making a big discovery to share the fantastic riches. fools will be blindly motivated by greed. The GM's dont need to know too much about the tunnel. it has a security system as far as they are concerned. Well, here is the awesome part. in tunnel, deep, near portal, you blow the entrance, play innocent! the thugs have sealed you in but we can work a way out. Nah, step thru portal, blow the rest of the tunnel, flood it with magma and falling rocks. If more then a few survive, i call BS. Either way, awesome, and its not like you are overseeing it too much, so it doesn't draw too much suspicion, just you paying goons to dig the mine while you guys adventure. nothing wrong at all...untill they are all molten slag.