umm, the same thing you do on any other fight, pretty much.

I always aoe down the 3 adds at start with Fire III, Fire II x3, Swiftcast Flare, Convert, Flare, Mana Pot, Flare, then switch to twin, that starts you out at like 500+ dps, then you start your normal single target rotation on twin, which depending on rng with thunder cloud/fire starter, and crit procs, should slowly decrease till you are around 300 sustained, youll dip a bit each time you get stuck in a conflag.

When snakes spawn, I again aoe the three of them with the same aoe rotation from start, which brings them down to under 50% while rest of DPS focus Ascep, Manawall to eat first 2 divebombs and keep singler target DPSing ascep, run out with rest of group on 3rd divebomb, get in what you can till snakes grouped for LB, if adds aren't dead after limit break, Fire III and swiftcast a Flare or two, then back to single targeting Ascep till dead.

After Twins AOE, get to whatever area you plan to spend the phase at, DPS twin, slow and DPS deadknight, DPS twin for another 20 seconds or so, slow and DPS dreadknight, repeat till next phase, then home stretch.

But, I mean that's its lol, keep thunder up, and pew pew with fire, shouldn't ever go below like 260 dps at worst.