the imperium is a vast empire of different chapters ranging from righteus space nazis to crimson red killers.
The Blood Angels are among the most revered Chapters of the Adeptus Astartes, renowned for their heroic defence of the Emperor's Palace at the height of the Horus Heresy and fighting at the forefront of the Imperium's wars for more than 10 millennia.
Blood Angels have some of the strongest army-wide Marine rules in the game, which put them in a pretty strong place off the bat. Their Chapter Tactic remains unchanged and gaining a +1 to wound in melee army-wide is pretty dang bonkers.