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This guide is intended to provide a comprehensive description of the encounter with Omnotron Defense System in Blackwing Descent. It is targeted to anyone who desires to understand the fight mechanics.
This guide is updated for World of Warcraft 4.3.
The Omnotron Defense System is one of the first two encounters in Blackwing Descent, both of which need to be defeated for the raid to gain access to the other bosses. This is not a gear check of any sort, but is meant to test the awareness and reaction time of your raid.
1. General Information↑top
1.1. Health Pool
Omnotron Defense System's shared health pool is as follows:
1.2. Enrage Timer
The Omnotron Defense System has no enrage timer.
1.3. Raid Composition
The following raid compositions are advised:
2. Overview of the Fight↑top
This fight is a council type encounter, where you will be faced with four construct bosses, who from this point on will be called "trons". The trons have a shared health pool. Two of the four trons will be active at any one time (with the exception of the pull, when only one will be active).
3. Detailed Explanation of the Tron Rotation↑top
To understand the interaction of the mechanics present in this encounter and how to handle them it is first imperative that you understand the basic principles that determine which trons you are facing.
Each tron has an energy bar which serves as a counter. A tron activates with 100 energy and deactivates when he reaches 0 energy. The energy of a tron decreases steadily over time from 100 to 0. This process takes exactly 90 seconds, regardless of any player action. A new tron becomes active each time the energy bar of a currently active tron reaches 50, thus every 45 seconds. The order of activation of the trons is random the first time that the encounter is engaged in the lockout, all subsequent attempts following the activation pattern of the first attempt.
The image below illustrates this sequencing:
The complexity and difficulty of this fight stems not from each of the individual trons' mechanics, but from the dynamic interaction between them and the confusion that this can cause for unprepared raids and less reactive players.
4. Summary of Abilities↑top
Each tron has his own set of abilities, in effect only while the tron is active. Each tron has a shield mechanic, which is cast when he reaches 45 energy (shortly after a new tron activation) and lasts for 10 seconds or until broken. In addition to their shields, the trons have two other abilities each, which they cast regularly.
Magmatron is the fire tron and his abilities are:
Toxitron is the nature/poison tron and his abilities are:
Arcanotron is the arcane tron and his abilities are:
Electron is the electric tron and his abilities are:
5. Dealing with Abilities↑top
Especially for raids learning the encounter or who are not yet at a point of gear or skill where it becomes trivial, it is imperative to stop attacking the trons when they are shielded as soon as possible. If Magmatron and Electron's shields are broken, the damage will, most often, wipe the raid. Arcanotron's buff from attacking the shield can be purged or spellstolen, and the debuff that Toxitron places on raid members attacking his shield can be dispelled, but it adds extra strain on the healers. Because the trons have a shared health pool, and the shields always become active at the same time as a new tron, it's advisable for your raid to simply switch DPS to the newly activated trons.
Magmatron's Incineration Security Measure is a rather powerful AoE fire damage ability which hits the raid regularly while he is active, and it is damage that the healers must simply heal through. Use of damage reducing cooldowns such as Aura Mastery, Power Word: Barrier and Divine Guardian can be alternated to help mitigate the damage. Healing the damage from this ability is easier if your raid is stacked together.
Magmatron's Acquiring Target, however, can cause problems if your raid is stacked. The tron will target a random raid member (can be anyone, including either of the two tanks) and after 4 seconds will begin channeling fire damage onto them for 4 seconds. This damage must be healed through, although it can be fully avoided (indeed, the tron will simply stop casting the spell) through use of invulnerabilities and its damage can and should be greatly reduced through use of other damage reduction cooldowns. Below you will find a list of abilities useful against Acquiring Target.
Complete damage removal:
Significant damage reduction:
The most important aspect of Acquiring Target is that it is a cone-shaped ability, which will damage anyone who is located between Magmatron and his target, as well as anyone in the immediate vicinity of the target. If the target moves while the spell is channeling or is being cast, Magmatron's fire will follow them around. For these reasons, it is important that whoever is targeted by this ability quickly positions themselves in such a way as not to damage anyone else, and other raid members (especially tanks and melee DPS) need to be mindful of this as well and adjust their position accordingly.
Toxitron's Chemical Bomb is fairly harmless in itself, but can cause damage spikes for anyone careless enough to be inside it and be targeted by one of the other trons' abilities. A good use of the poison cloud is to have your tank(s) position the trons inside it and thus cause them to take 50% increased damage.
Poison Protocol, Toxitron's second non-shield mechanic, can be extremely deadly if not dealt with appropriately. The tron will summon 3 adds in 10 player mode and 5 in 25 player mode twice during his active period, and these must be focused down and killed by the DPS immediately. Upon spawning, the adds will fixate on random raid members (they can target anyone except for Toxitron's tank) and begin to chase them, detonating on contact with their Fixate target. It is noteworthy that each add will only detonate when reaching its designated target, and not when coming in contact with other players, including melee classes. When detonating, the subsequent explosion will deal a massive amount of damage in a small radius around the target the add was chasing thus potentially causing several deaths. For this reason, it is important that melee DPS and the other tron's tank move away from Toxitron until the adds have chosen their targets. The adds can be slowed through most means, and they should be killed with priority. Whoever is being chased by the adds needs to be extremely careful, and run away from the adds until they are dead.
Arcanotron's Arcane Annihilator is one of the major causes for raid wipes on this encounter, and is a mechanic that requires constant attention while this tron is active. Arcanotron will target random raid members with this spell, and unless interrupted, will cause very high amounts of unpredictable damage to the raid. It is advised to have another dedicated interrupter for this ability in addition to Arcanotron's tank. While Arcanotron is shielded, any attacks will increase his magic damage done and reduce the cast time of Arcane Annihilator, making it harder to interrupt. Because Shamans and Mages can purge and spellsteal the buff respectively, it is advised to have them handle interrupts during his shield. This is also a good idea because Shamans and mages can interrupt with ease without needing to attack their target, thus not cause any additional stacks.
Power Generator is absolutely essential to defeating this encounter, and your healers should make extensive use of the mana regeneration that it offers. All raid members should attempt to make use of the extra damage dealt bonus of it, but should be ready to leave it at a moment's notice if they are targeted by Magmatron's Acquiring Target or if Electron becomes active. Power Generator is always spawned under Arcanotron, and healers and DPS who are in a Generator which is about to expire should move to Arcanotron and be prepared for the next one. Tanks should make sure to move trons out of Power Generator to avoid granting the tron increased damage done but should keep them close enough to the generator to allow melee DPS to attack the tron as well as to reduce the required amount of running from healers and DPS wishing to enter the next generator.
While Electron is active, your raid should be spread out to avoid splashing damage from both Electrical Discharge and Lightning Conductor. The only raid members who should not spread out are your healers, in case there is any Power Generator available. If this is the case, your healers must be very quick to move out if they are targeted by Lightning Conductor.
As mentioned earlier, the complexity of this encounter stems from the interaction between the trons (and their respective abilities), and the key to defeating it is to understand correct positioning and reaction to abilities during any of the possible tron combinations. A few general points must be made about this encounter, after which the above-mentioned combinations will be analyzed in depth.
Firstly, the trons reset if they are targeting players who have left the combat area (thus, players who have passed the doorway), so unless you want to reset the encounter on purpose, avoid leaving the room.
Secondly, it is crucial to be aware of which tron will become active next; this is indicated by a beam of light targeting the upcoming tron (red beam for Magmatron, blue beam for electron, pink beam for Arcanotron and green beam for Toxitron). Knowing which tron will activate next allows your raid to take precautionary measures (such as spreading out beforehand).
6.1. Magmatron and Toxitron
This particular tron combination is not too problematic. Your ranged DPS and healers can be stacked together without any difficulty, but should be prepared to move out of Chemical Bomb, as being affected by it while also taking damage from Incineration Security Measure can cause a wipe. If your raid is choosing to stack during this time, healing will be much easier, and provided reasonable reaction from your Acquiring Target target, movement will be kept at a minimum. Toxitron's adds should be dealt with, of course, with priority.
6.2. Magmatron and Electron
This tron combination causes very high amounts of raid damage, and will strain your healers more than any other. You will want your raid spread out at least 8 yards apart at all times while Electron is active to minimize the damage from Electrical Discharge, but this will lower the efficiency of AoE healing abilities during Incineration Security Measure, so plan accordingly (single target heal where needed, use of raid cooldowns or personal cooldowns). If your raid is spread out, Lightning Conductor should not pose too many problems (though whoever is targeted should still be mindful of their position). If Acquiring Target targets someone who is in the middle of your spread-out raid, it can easily lead to multiple people being hit, so be careful.
6.3. Magmatron and Arcanotron
A less raid-damaging combination, this promotes stacking inside Power Generator for your entire raid, but again, players targeted by Acquiring Target should be ready to move out at a moment's notice. Interrupting Arcanotron's Arcane Annihilator remains a priority, as coupled with the damage from either of Magmatron's abilities, it can quickly lead to a death.
6.4. Toxitron and Electron
This is a fairly trivial combination to deal with. Your raid should be spread out to avoid damage from Electron's abilities, which also leads to fewer people needing to move out of Chemical Bomb. Toxitron's adds should, of course, be dealt with switfly.
6.5. Toxitron and Arcanotron
Since there is no raid damage going out during this phase at all, assuming that Arcane Annihilator is properly interrupted, it is safe for your raid to stack in Power Generator even if while there you are also targeted by Chemical Bomb. Toxitron's adds should, as usual, be killed quickly.
6.6. Electron and Arcanotron
The final combination of trons you can be faced with requires you to be spread out for most of the phase because of Electron's abilities. Yours healers should make maximum use of Power Generator, and simply heal through any Electrical Discharge damage on themselves. If a healer is affected by Lightning Conductor, it is imperative that they move out as soon as possible.
7. Tips and Tricks↑top
The trons do not reset aggro when they go inactive, so after the first cycle, threat on the newly activated trons is not a problem - however on the very first activation of each tron, the tanks should be on their toes to make sure healers do not get killed.
You can maximize your raid's DPS on this fight through multiple means:
The ideal time for Heroism/Time Warp/Bloodlust is either when a combination of the above has been attained (such as debuffed boss and buffed raid) or simply at the pull, when focusing on a single tron and a limited set of abilities will allow your raid to remain stationary and do more damage.
8. Learning the Fight↑top
Since there is no mechanic in this encounter that requires high damage output from your raid (with the obvious exception of Toxitron's adds - but that is more about control and reaction than about raw dps numbers) and there is no enrage timer, it is a feasible strategy to use extra healers while learning the encounter. In 10 man, using a 4th healer can often make a huge difference in how well your raid can handle the extra damage taken from abilities being improperly dealt with. In 25 man, using 8 or even 9 healers can work.
Obviously, this will lead to a much slower kill, but will provide a lot more learning time for people to become accustomed with the various abilities.