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Some of this is plagiarized from the COH Gameamp website but I added some very important parts.
I recommend that your whole team carry about 6 wakies each before beginning this trial. We loaded up on them before we started and we may have needed all of them. I know I used all 6 of mine on myself and teammates. My team was a pick up group and composed of a stone tank (myself), 3 defenders, 1 PB, 1 blaster, and 2 scrappers.
Get trial from Mairenn MacGregor in Atlas park next to sewer entrance.
1. Defeat aliens in abandoned sewers: Defeat 100 Rikti.
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You'll get an ambush in the regular sewers on the way to the abandoned sewers.
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After defeating all Rikti and Kraken on the lower level, it is time to kill the Hydra's tentacles. I don't think the thermal cannons were particularly effective against the tentacles and most of the damage was done with normal powers.
Its hard to say if the thermal cannons can damage the head, too, but the particle cannons will definitely do it. Normal powers will not damage the Hydra Head.
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Damage logs will show what's effective and what's not.
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This is the most frustrating thing ever made. Beats Shadow Shard TFs hard.
Time will expire when the hydra head is at 10% hp ALWAYS.
@Prandi - Freedom
Arcs:
# 143959 - Freedom Phalanx, Arachnos Forces and the Deadly Virus.
Some of this is plagiarized from the COH Gameamp website but I added some very important parts.
I recommend that your whole team carry about 6 wakies each before beginning this trial. We loaded up on them before we started and we may have needed all of them. I know I used all 6 of mine on myself and teammates. My team was a pick up group and composed of a stone tank (myself), 3 defenders, 1 PB, 1 blaster, and 2 scrappers.
Get trial from Mairenn MacGregor in Atlas park next to sewer entrance.
1. Defeat aliens in abandoned sewers: Defeat 100 Rikti.
2.Once finished, the person that got the mission has to go back to Mairenn and she will give you a code to use on a computer to open a door in the middle of abandoned sewers (this will be marked on your map). Use the access code to enter.
3. Clean out the maintenance room: 1:30:00 Time limit. Killing fast is very important due to the time limit so make sure you have enough damage dealers in your group.
You must travel down a series of bridges and ramps to reach the Hydra at the bottom of the sewer. Along the way, there will be 8 gun boxes as glowies that you must use against the Hydra Head and tentacles. The glowies give you a temporary power that you must slot to use. Thermal Cannon is for the tentacles and Particle Cannon is for the Hydra Head. I don't think it is necessary to get all 8 glowies to complete the miss, but that is what we did.
We got to the bottom of the sewer about 30 minutes into the mission. Once you reach the bottom of the sewer you must kill all Rikti and Kraken there. The Kraken are monsters somewhat concealed in the rocks and pathways in between the Hydra and generators. They have a ton of health so it takes a minute or two to kill just one. If you don't find them and kill them before taking on the Hydra, it will come back to haunt you. The Rikti are guarding the 4 force field generators.
After defeating all Rikti and Kraken on the lower level, it is time to kill the Hydra's tentacles. I don't think the thermal cannons were particularly effective against the tentacles and most of the damage was done with normal powers. The Hydra Head uses Psychic tornado and has a one shot psychic attack killer. As a stone tank, I toggled on my psi defense and taunted all tentacles in sight as well as the hydra head.
After all tentacles are dead, you need to destroy the four Force Field Generators at the same time to lower the shield protecting the Hyrda head. I dont think that it is essential that all 4 gens are destroyed exactly at the same time, but coordinating this so that they are destroyed at about the same time will maximize the amount of time that the shields are down and you can fire away at the hydra head. I assigned my team into groups of 2 which included one damage class per group. THIS WAS DONE OUTSIDE THE MISSION BEFORE THE TIMER EVER STARTED so we didn't have to waste any time with it once inside. We split up into our 4 groups and each found a generator. Each team said when they were at a generator and ready. Once all were set, the order was given to destroy the gens. I snuck off a few seconds early before my gen was destroyed by my teammate so I could grab aggro on the hydra head before the others arrived. One of my teammates commented that they felt like a ghostbuster when firing the particle cannon. Its hard to say if the thermal cannons can damage the head, too, but the particle cannons will definitely do it. Normal powers will not damage the Hydra Head. We got the hydra head down to about 75% health when the force fields came back up and we had to retreat. Rikti will respawn around the generators after each time they are destroyed so we killed them at all four before splitting up again into our teams to simultaneously destroy the gens. This must be repeated until the Hydra head is defeated.
Here is the toughest part of this trial. Twenty or so Rikti will spawn around the Hydra head when it reaches 50% health and again at 25% health. We retreated from the Hydra each time and fought the Rikti in the caves. I switched to granite armor when fighting the Rikti away from the Hydra. My team almost wiped during the retreat both times but we revived and survived. Thank goodness for granite armor! Team teleport would have made the retreat and regroup much easier.
It took us four cycles of destroying the generators and firing at the hydra head before we defeated it with 5 minutes left on the timer.
Rewards: A rare recipe. You will also receive the Exploration badge Head of the Hydra when you stand next to the head and the badge Charmer for defeating the Hydra Head.