First Boss just dps him and save your readiness for the 2nd explosion.
Second Boss use the tactic like when u are there with a 5man grp.
Third Boss try to get as few hits as possible from the adds on you or your pet and keep your cooldowns for the phase between the barriers so u still got the debuff applied.
Last Boss nothing much to say,

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Music:
Two Steps From Hell - Atlantis
Two Steps From Hell - Heart of Courage
Two Steps From Hell - Everlasting
Two Steps From Hell - Invincible
Two Steps From Hell - Immortal