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As the fight starts, the raid is split in two and has to right click on the portals in the room to gain an "essence." Each half of the raid fights one boss or the other for the duration of the encounter. The light essence half of the raid fights Edyis Darkbane while the dark essence half fights Fjola Lightbane. The raid should be clustered together around the boss - not stacked, but not too spread out. See the video for the example of this clustering.

The essences work similarly to the polarity mechanic in Ikaruga (thank you, WoWWiki). When a player has the dark essence, they absorb dark damage and deal less damage to dark targets while doing more damage to light targets. Light essence is just the opposite: players absorb light damage, deal less damage to light targets, and deal more damage to dark targets.

Primary abilities:
1. Concentrated Darkness/Light Ball: Throughout the fight, there are black and white orbs floating throughout the room. The black orbs are concentrated darkness while the light ones are light balls. Light players cannot be near/touch the black orbs and vice versa for dark players and light orbs. The orbs move at random and simply must be dodged by players. If dark players hit/stand near exploding dark orbs, they absorb the damage and if they have absorbed enough, may gain a buff to damage. See video for examples of players dodging the orbs.
2. Shield of Darkness/Lights and Twin's Pact: Periodically during the fight, one twin will put up a shield (absorbs 250k damage) and begin a 15 second cast that heals for 20% of the Twins' HP. This must be burned through to interrupt the cast, so when the shield goes up all DPS must switch to the shielded boss to stop the heal from going off.
3. Dark/Light Vortex: Periodically during the fight, one twin will begin to cast a vortex. All players fighting the twin channeling the vortex must immediately switch essences to absorb the damage, then switch back after the cast is complete.
4. Surge of Darkness/Light: This is essentially just a damage aura that inflicts about 1500 damage every 2 seconds.
5. Twin Spike: This is an attack that increases damage taken by the tank. No other strategies even mention this or note it as being a problem; however, a third tank should probably be on hand to pick up a boss if a tank dies to this attack. The solution to this may be that the tanks have to swap bosses periodically in order not to receive too many debuffs of one type or the other.

This looks relatively simple overall - mostly tank and spank with an essence switch at the vortex. The tanks remain stationary and do not switch.