“ 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”
“ Orchound - A large canine with tusk like bottom teeth. Orcs bred these dogs to help them in battle by grappling with foes, and dragging them to the ground. Despite their fearsome appearance and loud bark, they are trained not to kill, this is the venue of the warrior, not his hound.”
“ 'Look, lad! You see the streak of glowing green off the larboard bow? Them's the bright waters!'
While the lad peered intently at the eerie glow, the old salt continued. 'Entire ships have been lost to the Bright, lad, for once you let it surround you, you'll never touch land again!'”