If your players have gotten into a “tank and spank” routine where one battle begins to look a lot like the one before, the Magestone Maelstrom Rockeater (level 16) can mix things up a bit.
Its area attacks make it ideal for making your players move around and spread out to avoid several players all taking damage at once. Use a couple of these creatures and the effect doubles, breaking up their standard formations and making them think of new strategies. Since the most memorable battles are usually the ones where you have to make a lot of tough decisions, this creature is one to remember.
Try out the Magestone Maelstrom Rockeater
Running a lower level campaign? Try the level 7 version of the Magestone Maelstrom.