StarCraft 2: Legacy of the Void | Essence of Eternity - Brutal

The 2nd (next to last) epilogue mission of StarCraft 2: Legacy of the Void campaign played on brutal difficulty using siege tanks and vikings. This should be the final mission as it is by far the most difficult. Completed by killing no more than 15 units with Kerrigan's celestial beam (mastery achievement "Purity of Purpose").