"The walls moved!" Krunis exclaimed. This he was sure of it this time.
"Of course they did. They are trying to accommodate the additional room needed for tonight." Xarn returned matter-of-factly.
Living stones are tuned to one master to do his bidding.
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