This is my first try on The Void Ark's Final Boss, Echidna! That is the new Raid available in the new 3.1 patch which was just released today!
While this isn't my tutorial for the fight yet, it shows the mechanics for the (fierce) fight, the most important being separate the three mobs when pop and kill it fast enough so the alliance can survive their special attack.
Other than that, don't look at the boss when it uses Petrification, and stay close to it when it uses the Slashing AoE. Other than that, just avoid AoEs and focus target on the main boss when taking the other two adds to see what it's casting.
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