i can sum up a boss in every dungeon ive run so far, as a Tank in around 7 seconds, with a single line of text.

"Dont stand _____, Watch out for _____, Kill ___ when it spawns, _____ cant be avoided, _____ can be ignored, LB when _____"

Not all of them apply to every boss, But generally, at least half apply. if i see the new message, ill spit that out while running to/waiting for people to reach the boss room.