Have a dungeon that could fit anywhere? Want to get the heroes there in a hurry? Try this.
A wishing well is nothing more that a place to hope and dream. A token offering is given with the silly notion that the wish just might come true. But what happens when these wishes start to come true, on a regular basis?
Rather than making a baddy impossible to hit, consider giving it mega-hit points.
Super hard to hit leads to great player frustration. Allowing them to do damage leads to a sense of accomplishment. another variation of this would be to give the bad guy a forcefield that shows damage.You could also give them a mastermind ability that sluffs the damage of to minions who should be easy to kill.Once in a while a super high to hit encounter is ok ,but it should be few and far between.
Your mileage may vary