Heroic Varimathras

Tank

• Always stand within 8 yards of your tanking partner.
• Keep the boss still throughout the fight.
• Use active mitigation and taunt off one another when Shadow Strike is cast.
• Ensure that you will not get hit by the Marked Prey projectile.

Healer

• Stack as a raid and move from one side of the boss to the other each time Dark Fissures spawn.
• Heal up the ticking damage from the Torments of Shivarra.
• Players with Torment of Shadows cannot receive direct healing, although absorbs and spirit link works.
• Stack as a raid and move from one side of the boss to the other each time Dark Fissures spawn.
• Ensure that a mobile melee DPS soaks the Marked Prey projectile and uses a spell to counter the knock back.
• Kill the boss before the 6 minute enrage.

Source: Varimathras Antorus Raid Strategy Guide - Guides - Wowhead