Rules of the Boss

0: Minions X - Play each turn X extra cards from a deck of small creatures, blocking for the boss. Horde X - The same is true for attackers
0: The boss or endboss plays it´s abilitys as random or described in it´s cardtext.
0: If a boss is destroyed or removed from game, remove two loyalty counter instead. If the loyalty becomes 0, the boss or endboss is defeated.