Heroic: War is Hell

The EZ-PZ guide and how to be OP in the Battle for Stormgarde:
(tl:dr at the bottom)

1. If you happen to not be the leader, gain assistant so you can use /RW (essential in groups without proper knowledge)
2. Inform your group via /rw that the priority of things is to Defend>Get Resources>Push
3. On start be on the Mine group, capture it asap and on your way out make sure to get as many carts of metal as you can, you should be heading back to the base with around 100 metal.
4. Shortly after the first two bases (mine and lumber mill is what i call them out of habit) are captured, you will want to lead your group to your fortress and defend your commander (you absolutely should mark your commander and tell healers to heal him if your group is slow on sweeping the assault waves)
while bringing the Enemy commander which on HC attacks your fortress, to around 65% HP at which he teleports away.
5. After the attack of the enemy commander on your fortress you want to clear the remaining assault waves and then move onto Newstead and capture it asap.
6. This is where you want to spend your 100 metal to get a Kodo, by the time you will unlock newstead you want to have the Altar of Storms already built.
7. With your newly acquired OP Kodo, you want to go and solo Assault Waves, you may not want to finish all of it, just the 200k+- hp mobs and then just ignore the elite so that your Kodo doesn't die. The Kodo lasts for 6min and has roughly 2,3M hp which is very little to survive for a long time, so just clear the small mobs, this will effectively give you a HUGE chance to get a Essence (got 2 essences in 3 warfronts in a row with this method)
8. You can only get 1x Essence at a time,so make sure to go to the altar and get your OP buff asap,4x Bristling Power and Ideally 2x Wolf Rider for 50resources each from the Barracks and then order a push at Valorcall Pass, where you can just go absolutely HAM, Your activating trinkets and essences scale with your OP buff, so for instance, as a resto druid with Cyclotronic Blast trinket, i was able to Kill a 1,3M Elite with the trinket alone, then i did roughly 150K dps by just aoe dotting and catweave swiping (I ended up being top dmg in the group with 71M done as resto druid)
9. As you go HAM on the immense amount of mobs at Valorcall Pass, you are almost certainly going to get your second Essence, as most people will just lay back and observe you because they might not understand why you are suddenly oneshoting elites, but even if they don't, you are likely to get it anyways cus everything u do is some 190% stronger just by the altar of storm buffs + you have 2x wolf rider which will be on top of your abilities on the meter as well.
10. Get your second essence buff, wait for the gates to breach, go ham on the boss, accept people's "GJs and GGs as they look upon the damage meter and realize a healer just beat them by a huge amount.

TL;DR -

1. get resources quick
2. get Kodo for 100 resources at Newstead
3. solo assault waves with said kodo (except the big elites, ignore those) once the altar of storms is built, that will give you an essence
4. get your essence buff at the altar building along with 4x bristling power buff and if u have another 50 or 100 resources, get 2x wolf rider from barracks building
5. be OP af and kill everything as you are 190% stronger and have 2x insanely strong bodyguards

just to be clear although tooltip just says "complete", you must win the warfront to get the achievement.