Raid Expedition: Vim and Vigor  

Vim says 'We are here to tell you to leave. We shall not allow you to pass. If you [insist] on any attempt to do so, we will respond with force.'
You say, 'I insist.'
Vim says 'Then we will be forced to end your lives.'

When the event is initiated by speaking to Vim or Vigor, both go active at the same time and each has their own single-target Rampage. They must remain near each other. If they are pulled too far apart, one will be summoned to the other, and they will take the tank with them.
The bond between Vim and Vigor cannot be broken. They are drawn together and their power suddenly spikes.
You are coming with me, Yourname!

Vim and Vigor's health must be balanced within 5% throughout most of the event. If they become unbalanced, the boss with the least health will heal to that of the boss with the most health, and they both gain a bonus.
Energy swirls around Vim and Vigor. As their life energies are balanced, they gain strength from the exchange and emerge even healthier than before.

Vim casts Increasing Decay (increases spell damage taken by disease-based spells) and Barrier to Health (decreases healing received by ~35%) on five targets every 55 seconds.

Vigor casts Reduced Lifespan (a disease-based 85K DD nuke) on one target every 35 seconds, and Pulse of Death (a disease-based 48K DoT that drains 25K mana per tick) on one target every 40 seconds.

As you balance the twins down, they will select targets for debuffing with Protection of Sul, which is an invulnerability. This lasts for 60 seconds or can be removed by running into the Lifelight, one of several golden auras that roam around the raid area. The Lifelight removes the Protection of Sul debuff, but also strips all buffs that increase hit points or increase hit point regen, and the aura will fling you away.
Vim says 'Vigor benevolently chooses Yourname1, Yourname2, Yourname3, and Yourname4 and offers them protection from harm.'
You are protected by the power of Anashti Sul.

The twins will also summon reinforcements as the fight progresses.
The bond between Vim and Vigor has been weakened by your attacks. However, Bokon appear from nowhere and begin chanting, bolstering the magical power of Vim and Vigor, trying to keep their bond strong.
There are four bokon ritualists that spawn around the pool. They are non-aggro and must be killed quickly.
They chant: Ritualist of Life says 'The power of life has been given to each. Listen to what Anashti Sul will teach. From her you will regain your great health. And have no need for other wealth.'
If you kill the ritualists within 55 seconds, then Vim and Vigor's health become unlinked. You can pick a single target to burn for 20 seconds until their health-link is reestablished, and the boss with higher health snaps down to that of the lowest.
With all the ritualists dead, it will take time for Vim and Vigor to regain their bond of health.
Vim and Vigor have recovered their bond of health.

If you fail to kill the ritualists within 55 seconds, they cast a zonewide debuff that increases in strength with further waves of reinforcements.The debuffs are Minor Doom, Lessser Doom, Doom, Greater Doom, Crushing Doom, and Final Doom (DD nuke, destroys an amount of mana, and roots).
Ritualist of Life says 'Vim. Vigor. Your faith has been proven worthy, your bonds of health remain strong.'
Curse you who would assault our faith!

(As a warning, Vim and Vigor will both reset to full health if one of them gets pushed into zone geometry, such as if you fight them too close to a wall.)