Minstrel can be slept with Lullaby, but each time it is Lullabied the duration is reduced until it resists completely.
Many people recommend Ninja tanks for this BC, but if a kiting strategy is used for the Minstrel after killing the Berzerker, Paladin tanks do very well.
The Dragon's attacks are massively increased after they use their respective two hour, NOT, as some suggest, after one of the Dragons dies, thus it is irrelevant when either one is killed as long as it is killed quickly after its two hour. Note that a dragon might use its 2hour as early as 66% or higher.
Berserker uses: Mighty Strikes (War 2hr), Body Slam (Heavy AOE Damage), Chaos Blade (Cone AOE Curse), Heavy Stomp (Heavy AOE Damage + Paralyze)
Chaos Blade (Cone AOE Curse) effect gets stronger after they use their respective 2-hour. 50% HP/MP reduction pre-2 hour and 75% HP/MP reduction post-2 hour. The range for this ability seems to be 25'. It is possible to stun this move.