Alternatively, you can treat the bhole's head as its only actively dangerous portion. In this case, attacks directed at its immense body are irrelevant, with only those directed at its head (which consists of a 30-foot space) actually reducing its hit points. You might even run an encounter with a bhole using a truly enormous space on a battlematï¿1/2a space of 100 feet or more, perhaps. This solution presents its own challenges, obviously, particularly if your gaming area lacks for space. Of course, if these options for handling immense monsters don't sit well with you, the best solution is to simply downsize bholes in your game; assume they coil up on themselves and fit entirely into their 30-foot space, with their length accounting for their unusually enormous reach.