Equipments for bosses. They are created in the new equipments.yml file and added to bosses in bosses.yml. As for drops, they support multiple enchantment rolls.
Bug fixes
/lab spawn spawns bosses without any equipment, meaning that skeletons don't have a bow.
Entities keep their modified health and equipment even if they're no longer tagged as a boss.
/lab ignore doesn't apply damage from the player on the first hit.
/lab viewer displays the health unmodified by the current damage event.
Very rarely a player may gets credit for a boss killing without having given the final blow (happens on entities that have some kind of unphysical armor, like Zombies and Lava slimes).
Notable changes
As a consequence of the equipments.yml addition, a new value has been added to config.yml, which let you to decide what should become of the entity's original equipment when it's turned into a boss.
Bosses now use a damage multiplier instead of a flat damage, as how it was before the 2.0.0 version. You'll definitely want to update your config files. Sorry for the inconvenience.
assignationChance in abilities.yml is no longer used, assignation chances are now set in bosses.yml and in worldname.yml. The default value is 100.