I decided to compile some information about the fight. Partially to help myself getting the hang of the fight, partially to make our learning curve steeper because I believe this encounter is all about coordination and we should be able to complete this fight with the current gearlevel. I'll try to make this strategy so short and straightforward as possible. If you want an extended overview of bosses abilities etc. there is alot on WoWhead and other sources. This guide contains the basics to complete this fight on normal mode. Note: This is merely my vision on this fight, not the only nor the best way to complete it.
Omnitron Defense System is a council-like fight with four bosses, Magmatron Electron Toxitron and Arcanotron, with a shared healthpool of 60mil on 10man and 100mil on 25man. Every boss has different abilities who are fairly similar (each boss has some sort of barrier, AoE and single target attack). The fight starts simple with only one of them active.
Each boss starts with 100 energy. This energy slowly drops. When at 50 energy the next boss becomes targetable, which one it is will be announced by a beam going towards it. When a boss reaches 45 energy he will use his barrier-skill. No dps should be done when his shield is up (which is when the boss has anywhere from 45 to 25 energy) including tanks dps. When the energy of the third spawned boss reaches 50 the first one will turn to stone and become unattackable.
Notes to all raidmembers (M for Magmatron, E for Electron, T for Toxitron and A for Arcanotron):
*E: When you are targetted with Electrical Discharge move away from the raid, you will deal damage to close allies. Electrical Discharge looks like sparkling electricity on your character and will be announced by DBM.
*E: Lightning Conductor should be treated the same as Electrical Discharge. It looks like Elemental Shamans Thunderstorm and the player targetted should move out of the raid and raidmembers should move away from this player as it deals damage to everybody in range.
*T: When you are targetted by one of the summoned oozes, make sure they do not reach you. They will explode if they reach their target and should be killed ASAP. Oozes can and should be slowed as well but can not be stunned.
*T: Targets a random raidmember with Chemical Bomb. This player will drop a 25yard poison cloud which increases damage taken by 50%. It is easy to avoid and works on bosses as well.
*M: When it says Acquiring Target it will focus a red beam to a random raidmember. After 5 seconds a pillar of flame is shot at the target, hitting everything on its way with a 4 second dot. Feign Death, Iceblock etc. will negate the effect.
*M: Casts Incineration Security Measure: A raidwide AoE what needs to be healed through because it can not be avoided. Be sure to be in range of healers and not combine this with any bad things like poison clouds because that makes it very hard to heal through. Healing cooldowns, like Holy Radiance for paladins, should be used during this ability.
*A: Casts Arcane Anihilator on a random raidmember and deals pretty straight forward damage. This attack should be interrupted as much as possible and can be pretty dangerous when targetted at a tank.
*A: Casts Power Generator. Its similar to the poison cloud but increases damage done and also regens mana. Works on bosses as well. Creates a blue galaxy-looking whirling puddle on the ground.
*Do not attack shielded targets, this includes tanks. If too many damage is dealt to Magmatron or Electron he does ALOT raiddamage. Damaging Toxitron when his shield is up gives you a stackable dot and damaging Arcanotron when his shield is up increases his damage done and decreases his casttime of Arcane Anihilator what makes it harder to interrupt.
Notes for tanks:
*Channeled beams announce which boss will become attackable next.
*The first 30seconds or so the OT can dps the only active boss.
*Tank the bosses apart from eachother to avoid damage on shielded bosses by cleaves/multiple target attacks.
*If possible drag a boss in a poisoncloud (But be sure to not tank them too close to eachother)
*Drag the bosses out of Power Generator ASAP.
*Do not dps shielded bosses while tanking them (this includes autoattacking). The raids dpsers should switch target when the new boss spawns to avoid dpssing him with active shields, but tanks have till 45 energy to attack and use selfhealing abilities etc. (think paladins Word of Glory which requires Holy Power). This is especially true for Toxitron and Arcanotron, Magmatron and Electon have some room for error here.
*It might be worth to switch the tank who has most interrupts to Arcanotron so he can interrupt Arcane Anihilator and all dps can be truly functional. A ranged dps being able to silence focus-targets could have the same effect tho.
Notes for healers:
*Magmatrons Incineration Security Measure is alot raidwide damage, cooldowns should be available during this attack.
*Keep an eye out on raidmembers targetted with Lightning Conductor (Electron), Acquiring Target/Flamethrower (Magmatron) and people who accidentally attacked Toxitron while shielded (they'll get a stacking dot).
*Stand in Power Generator when possible (range) for mana regen.
Additional notes:
*There are different good times for heroism E.G. when all dps can get in Power Generator or a boss is tanked in a poisoncloud.
*Oozes summoned by Toxitron should be slowed.
Hope that summs it up for quick reference. After reading this you should be able to see exactly whats going on in the fight, watching the encounter on youtube helps alot to recognize the "fire" you need to move out of.
Lets kill them next reset
Sources:
Tankspot
WoWhead
YouTube
). It depends alot on what golems are active, but it still needs an interrupt rotation as the fight is already hard enough on healers and it hits tanks too (Arcane Annihilator on tank is pretty much an instagibbed tank).
