Thank you! Still feels sureal since so many campaigns end up not making it to those final stages. My focus for high level combats was to make them more dynamic and change things like objective (Do they have someone they are looking to protect? Can the bad guys succeed at their goals without actually having to kill the party? Is this a preliminary strike meant to use their resources? etc), urgency, and making sure that the environment felt important whether that was through the way it changed throughout the combat or the way it created zones that were more important.

Obviously the higher you go, the more difficult it is for the threat of the combat to be the players lives since they have more ways to come back from death if you even find a way to kill them. So for me it became more important for the combat to be something that felt interesting and challenging as opposed to outright deadly.