If only the game system had a mechanic that allowed for powerful targets to act outside of the established turn progression so that they could keep up with player party action economy and continue to pose an interesting threat throughout the combat round.
Oh wait, the 5e system does have that. They're called legndary actions, and Larian decided not to implement them.
Edit: Sorry, that's not helpful, I know... but there is a possibility that if you look at the mod community, you'll find folks working on mods that try to bring the game closer to actual 5e rules, and they may have the answers you're after, if they've worked out how to give bosses legendary actions and legendary resistances.
Last edited by Niara; 08/11/23 01:17 AM.