Okay, I'm not sure if this is common knowledge for people, etc. I haven't found this method on the forums when I did the simple search: "Flame Leviathan".
But here's what you do and what you need:
-You must have 4500+ Gear Score, me and my partner have 5000+ and do this no problem.
First and for most kill the trash. This can be done single-handedly if you haven't found a partner or you're waiting for one of your friends to be ready, etc.
Anyway, once the trash is killed, the towers are down and the bases are down as well here's what you need to do:
- If you don't want to die, but you've triggered the Flame Leviathan, than run out before the yellow barrier is put in place. That'll make him glitch out and it'll make your vehicle blow up and you'll be out unharmed if he doesn't kill you.
- If you don't care about dying than let him kill you, let him get back into place and get in your vehicles, you should have one Motorcycle and one Siege engine.
- First off the place you want to position your Flame Leviathan is pretty much wherever you're out of range, you want to park yourself just out of aggro range.
-Inside the box he closes off on the ground there's a small outline of red on the ground, a different layered "brick". I normally put myself on top of it, like in this picture.
[spoiler][/spoiler]
TO THE KILLING!
- The person in the Motorcycle, the only job you have is kite the Flame Leviathan around and lay down tar as often as you can, whilst of course staying alive.
- Okay, now the person in the siege engine should stay in the gunners seat the entire fight, he doesn't move from the first position you put him in. The only time you ever switch out of the gunners seat is to switch to the drivers seat, but you have to switch back just as fast or he'll target you instead of the Motorcycle.
-- Now the only move you should use as a Siege Engine is the Cannon one. Skill #2 on the Actionbar. That does anywhere from 30k-280k, it's pretty random. But a normal direct hit always hits for above 100k.
The person I do this with is a Engineer, so he Disassembles the Flame Leviathan after. We do it each week.
This is good for gearing guildies, if you want another person in.
TL;DR Explanation:
- Park Siege Engine just out of the Flame Leviathans aggro, Siege Engine driver(s) hop in gunners seat and switch back QUICKLY every so often. (So your vehicle doesn't explode randomly.)
- Motorcycle Kites Flame Leviathan around laying tar.
- Use the Cannon on the siege engine and kill the Flame Leviathan.
- Loot/Disassemble
- Kinda, PROFIT!