Omnitron Defense System
This fight consists of four Elemental Golems, Arcanotron, Electron, Magmatron, and Toxitron. You will always be dpsing one golem at a time, but tanking two at a time, and all four golems have a Shared-Health pool.

Raid Composition:
Tanks: 2
Healers: 3
DPS: 5

Power Generator: Summons a Power Generator under a random friendly target. This increases damage by 50% of all friendly and enemy targets within 5 yards. Lasts 1 minute. Channeled.
Arcane Annihilator: Inflicts 48,750 to 51,250 Arcane damage to a random enemy target. Unlimited Range. 1.5 second cast.
Power Conversion: Power Conversion converts damage against the target to be converted into additional Magic damage and cast speed. 1.5 second cast. **SPELLSTEAL**
Lightning Conductor: Infects an enemy for 10 seconds. Causing it to inflict Nature damage to its nearby allies every 2 seconds. 45 yard range. Instant.
Electrical Discharge: Inflicts 29,250 to 30,750 Nature damage to up to 3 enemies within 8 yards. Damage is increased by 20% between each jump. Unlimited Range. Instant.
Unstable Shield: Attacks against the Unstable Shield cause a Static Shock at a nearby enemy's location. Static shock inflicts 58,500 to 61,500 Nature damage to enemies within 6 yards of the target. Unlimited Range. 1.5 second cast.
Incineration Security Measure: The Defensive Measure inflicts 14,625 to 15,375 Fire damage every 1 second for 4 seconds. Unlimited Range. 1.5 second cast.
Acquiring Target: Acquiring a target. After 4 seconds, Magmatron will begin to channel his Flamethrower on the target, inflicting 34,125 to 35,875 Fire damage every 1 second to all enemies infront of him for 4 seconds. Unlimited Range. Channeled.
Barrier: Absorbs 150,000 damage and if the barrier is broken it releases a gale of flame, inflicting 73,125 to 76,875 Fire damage to all enemies. Unlimited Range. 1.5 second cast.
Chemical Bomb: Fires a Chemical Bomb at a random target, causing a Chemical Cloud at the location. Unlimited Range. Instant.
Poison Protocol: The Poison Protocol creates a Poison Bomb every 3 seconds that will explode after coming in contact with its target or after being killed. Unlimited Range. Channeled.
Poison Soaked Shell: Applies Soaked in Poison on melee and spell attacks which inflicts 5000 Nature damage every 2 seconds. Stacks. Unlimited Range. 1.5 second cast.

Boss Fight:
There really aren't any phases, other than transitioning through each of the four Elemental Golems. I will be giving brief descriptions of what the raid should be doing on each fight, not exactly a full on strategy that we follow step by step since the four golems can come at us in any order.
Tanking: The way that the golems change phases is their energy bar. The bar over time decreases and when a second golem is activated, the currently active one will spawn his unique shield that each of the four golems have. The second tank will pick up the new golem, and the first tank will continue to tank the first golem down to 0 energy, and then pick up the third golem. Rinse and Repeat.
DPS: Dps the first golem until the second golem comes out, as soon as the newest golem is activated, ALL dps swap to the new target, and continue to repeat this process until the fight is over. Rinse and Repeat.

For this golem, positioning is insignificant. Simply tank him near the middle of the room, but tanks have to be aware of when he spawns a Power Generator. This will spawn under him or either another golem that may be active at the time. Instantly pull which ever golem that is on the generator off, and have all Ranged DPS and possibly healers (depending on which second golem is active at the time). The other ability Arcanotron will use is the "Arcane Annihilator" which is just like an Arcane Barrage. Simply heal through this damage or interrupt it with a kick, or ect.
When the second golem becomes active, Arcanotron will use his shield ability. This shield is called Power Conversion, and is a shield that absorbs all damage and gives Arcanotron a buff that increases his Damage and Attack Speed ***This is Spellsteal-able!!***
For this golem, positioning is important for the ranged. One of the two abilities Electron has is a chain lightning called Electrical Discharge. This Chain Lightning also increases its damage by 20% every time it jumps, so spread out ranged. The other ability Electron will use is called Lightning Conductor. This ability is similar to the Freya ability "Nature's Fury". It will be casted upon one raid member, and that member has to get out of the raid, away from everyone to stop dealing AoE damage to allies nearby them.
When the next golem becomes active, Electron will use his shield ability. This shield is called "Unstable Shield" and will cause AoE damage to the attacker and anyone around the attacker within 6 yards, there is no benefit to attacking this shield, make sure ALL DPS is swapped to the new golem instantly before this shield is active.
For this golem, positioning is somewhat important for one of his abilities. One ability Magmatron is called Incineration Security Measure. This ability is not completely avoidable but can be reduced in damage if you stand between the flames. The second ability Magmatron has is called Acquiring Target. This ability will target someone random in the raid, and cause a red beam to go to that target. After four seconds, Magmatron will use his Flamethrower attack, and the target, and anyone within that line of fire, will be hit with massive fire damage, make sure you are not near, or in front of the person targeted by this.
When the next golem becomes active, Magmatron will use his shield ability. This shield is called "Barrier" and it is very important to stop all DPS before this shield comes up. When Barrier is active, the shield will only absorb 150,000 damage, and then break and cause an instant wipe.
For this golem, positioning isn't as important as being aware of your surroundings. Toxitron's first ability is Chemical Bomb. This ability will be used on a random raid member and will cause a large gas cloud to spawn on the feet of the person. The poison cloud also puts a debuff on you that causes you to take 50% more damage. Get out of this asap. The second ability Toxitron has is Poison Protocol. This ability is casted by Toxitron, and will spawn three oozlings that will chase a random raid member. When/if the ooze reaches the raid member, it will explode for massive damage and most likely kill the person. These oozes must be DPS'd down asap, but be aware that these oozes can be spawned and chase melee dps.
When the next golem becomes active, Toxitron will use his shield ability. This shield is called "Poison Soaked Shell". This shield will put a stackable nature debuff on the target attacking him, but also cause that target to do an additional 50% damage for the duration of the debuff.

YOUTUBE LINK:How To: Omnitron Council - Blackwing Descent (The Yogscast)
ABILITIES LINK:MMO-Champion Skill List