Okay Gang,
I need your help here. I'm trying to build a super arena for a game I am running. I have a grid 8 by 8 that will have separate zones with separate effects that can be occurring at the same time. I'm looking for terrain effects that can have an effect on combat that are constantly changing. Ideally I would have as many as 100 and wood able to roll Cent I'll determine what happens in any particular grid. I'd like them to be scalable by CR so that the arena can grow with the players and they can return again and again. I think some obvious ideas would be a pit trap, elevation change, any other spontaneous trap effect, and the like has anyone seen this type of thing done before?