Our DM likes to target spell casters and will ignore high AC martial characters in favor of chasing down spell casters. How do you deal with enemies that can use a legendary action to move after another player without provoking opportunity attacks and can choose to save from a spell?
The next big fight will probably be indoors. The party consists of an AC 20 sword and board paladin, a celestial warlock that likes to fight mid- to front-line (?!?), a barbarian with low HP that always recklessly attacks with GWM, an eldrich knight, a battlesmith artificer, and a circle of shepherd druid. Nobody is min/maxed and several aren't optimized. All are 9th level, but the next big fight will probably occur at 10th. Resources (gold and magic items) are very scarce.