SWTOR Corruptor Zero Dread Fortress operation guide
A guide to defeating Corruptor Zero, the fourth boss in Dread Fortress, one of the two new operations introduced with Patch 2.4.
Storymode
Loot: Unassembled Arkanian Offhand, 1 random Underworld Token, 1 random piece of Verpine gear (no set bonus) 1x Exotic Element Equalizer, 4 Elite Commendations.
HP: 1.4 million (8m)
Recommended gear: Artifact gear or above. You may want to have some Black Market/Arkanian gear just to be safe.
Differences from hardmode
Identical mechanics to hardmode except there is no tank swap, no Concussion Mine and the Unified Beam doesn’t really one shot you unless you are low in HP.
Hardmode
October 15 changes
- Concussion Mine now has a cast bar but it is very buggy. You get two versions of Concussion Mine, a fake non-stacking Concussion Mine and a real stacking Concussion Mine debuff. You just need to deal with the stacking version as the fake one deals no damage but the debuff icon remains on the player until they die/zone out.
- In addition to the buggy icons, Concussion Mine is now doing significantly much more damage (more so than in the video)
- 5.5 k damage at 1 stack
- 8.5k damage at 2 stacks
- 11.3k damage at 3 stacks.
- 14k damage at 4 stacks.
Video:
HP: 2.26 million (8m)
Loot: Unassembled Dread Forged Offhand (rating 178), 2 random pieces of Oriconian gear (rating 178, no set bonus), 2x Exotic Element Equalizer, 6 Ultimate Commendations, 8 Elite Commendations, and Corruptor Blade (orange mainhand/offhand legacy weapon)
Recommended gear: Underworld/Verpine. Kell Dragon is more than sufficient.
Enrage timer: Unknown
Key Mechanics
Tank Swap
- Tank receives a stacking debuff from boss that forces them to tank swap at 4-6 stacks.
Concussion Mine
- Appears to be a casted at random raid member sometime during the fight (no exact % but has a cast bar). Whoever gets this stacking debuff will near AoE damage to themselves and rest of the raid. They will need to run to the boss and damage him with this ability to get it removed.
Adds
- Droid adds that spawns before and during the fight. One of them will target a random raid member and put down a red circle with Missile Salvo.
Melee Mode
- Massive Slam – a PBAOE that deals around 4k damage.
- Heavy Slash – Channeled attack on tank that does a ton of damage. Healers/tanks need to be ready for this. Leaves a Bleed at the end (Physical) that can be cleansed by operatives/scoundrels and commandos/mercs.
Ranged Mode
- Anti-Gravity Field – red circle casted on tank that lifts them and cause aggro drop if not avoided.
- Chest Laser – Channeled attack w/ DoT that should be cleansed (tech)
- Missile Barrage – raidwide AoE centered on each person, spread out to lessen damage.
Past 20% mode
- Unified Beam – Laser attack past 20%, anyone caught in the path of the beam will be instant-killed. Adds at this point become melee.
Tank Swap
Tanks will be receiving a stacking debuff from the boss that increase the boss’s damage dealt to them so they will need to swap after 4-6 stacks. Swap at lower stacks if your tanks can’t handle the damage.
Concussion Mine
This is a new mechanic introduced to hardmode on live and it is something you have to beware as it can potentially wipe your raid if not handled properly. At a random time during the fight, one random raid member will get a debuff icon shaped like a mine. This debuff keeps stacking up and deals increasing AoE damage to the player and anyone around him. You will see him casting it but you can also tell if this debuff is is on your via your debuff icon or if you see a sphere keeps exploding over your character. When you receive this debuff, you will need to run next to the boss and damage him with this AoE attack to remove it.
- As of the October 15 patch, he also throws out fake Concussion Mine icons that does stack and deals no damage. Ignore them.
- Concussion Mine damage have being significantly increased as of the October 15 patch, he nows deals much more damage per stack.
- 5.5 k damage at 1 stack
- 8.5k damage at 2 stacks
- 11.3k damage at 3 stacks.
- 14k damage at 4 stacks.
Adds
Before you get to fight Corruptor Zero, you will need to face a large group of adds. The two adds to note are the D-03 Repair Droid which heals other adds and the D-15 Corruption Droid which drops a red circle on a random member and casts Missile Salvo on that player. Whoever receives that red circle needs to stay away from other players to prevent collateral damage. Missile Salvo hits for about 8k damage. Offtank will need to grab the adds and tank them.
- D-15 Corruption Droid can be crowd controlled to lessen the damage.
Melee mode
When Corruptor Zero is in melee mode, he will use the Massive Slam and Heavy Slash abilities. All of the droid adds that he spawns will be ranged.
Corruptor Zero himself have a PBAOE (Proximity based AoE) attack in melee mode called Massive Slam that deals around ~4k damage per slam. The cast time on it is only 0.5s but as long you stay a bit of distance away from him the attack isn’t something to worry about.
Healers and Tanks need to be aware of a channeled attack from Corruptor Zero called Heavy Slash. This is 3.5s channel that does a ton of damage to the targeted tank so be sure to pop defensive CDs if you see this attack coming up. It leaves a Bleed DoT (physical) that can be cleansed by operatives/scoundrels and commandos/mercs.
Ranged Mode
When Corruptor Zero is in ranged mode, he will used the Anti-Gravity Field, Chest Laser, and Missile Barrage attacks exclusively. All of the droid adds he spawn will be melee.
Anti-Gravity Field is a large red circle around Corruptor Zero that tanks and melee DPS need to get out of ASAP. This red circle not only lifts those who fail to get out (stun breakers does not appear to work here), it also cause aggro drop which can be a serious issue for tanks caught in the circle. Tank swap here if the main tank is caught inside the circle.
Chest Laser is the equivalent of Heavy Slash in melee mode, it is a channeled attack that applies a DoT at the end (tech) which should be cleansed. Normally this attack is reserved for tanks but if the tanks fail to get out of Anti-Gravity Field, Corruptor Zero will switch to the next highest threat and this attack can kill a DPS/healer easily.
Missile Barrage is the equivalent of Massive Slam in melee mode but this is a raidwide AoE centered on every raid member instead of a PBAOE. You will need to spread out to prevent overlapping damage (it is like the Titan 6 fight). This is not a channeled attack but rather there is a slight delay between the cast and the arrival of missiles so he can use other attacks while missiles are homing down your raid.
Unified Beam
Corruptor Zero goes into this mode shortly after hitting the 20-30% mark. He will randomly teleport to a section of the room (the room is shaped like a cross) and shoot his giant lasers. Anyone caught in the path of the laser will be instant-killed (even if you stand on the sides, the laser will still kill you). The trick to avoiding the laser is to 1) Mark Corruptor Zero so you know where he is and 2) Run to a corner and stand in the section of the cross that is diagonal to the beam (a simpler way to put this is don’t be in line of sight of the beam).
- The beam hits for ~50k damage so if you have any denfensive cooldowns that can reduce the damage or block the damage you may able to survive it.
Where he lands for the first time is random but after that he switches to the opposite half the cross so as long you are standing in the section where he was standing with the previous beam you won’t die to the beam.
