If you are struggling to 1 key Normal or Hard Hydra in RAID and you have Ninja and Shamael then this post is for you. Below you will find examples of 15m (Hard Hydra) and 35m (Normal Hydra).
Ninja is an awesome damage dealer anywhere in RAID and he also does very well in Hydra battles. His main damage comes from the Hailburn skill while his A1 can also hit hard around 100k or more. Furthermore, as the booster leader, he accumulates his Passive bonus much faster increasing his damage further.
What you have to do is put him as the Team Leader despite the fact that he has no Leader bonuses. Doing this, with Shamael in the team, will constantly boost Ninja's turn meter allowing him to do his attacks much faster.
Naturally the rest of the team can support by attacking the Head of Torment and supplying the supportive buffs and debuffs for maximum effectiveness.
The rest of the team is a FREE CHOICE depending on what champions you have. The only required or strongly recommended champions here are Ninja and Shamael.
Try to bring a champion who can cast AOE Slow, AOE ATK down + DEF down and Weaken if possible. You will also need one Reviver in case the weaker attackers die and need to be picked up. Your Arena Arbiter can do that job as well as supply ATK up and buff removal.
Important note: due to the Hydra battle RNG we have to restart if the Head of Torment does not respawn.
Example with my team (lots to improve) on HARD Hydra 15.76M damage:
Picture 1 - battle result:
Picture 2 - in-battle last turns:
Update: this week I managed to get similar result with Demytha
This week was unlucky, I had to play multiple times to get the Head of Torment to spawn again. I always got Blight or Wrath making me re-start constantly.
I also tried different combinations and finally finished with this one with Demytha, basically swapping Aox with her. I lost the benefits of Aox but got healing, cleanse and block damage. Still not ideal, I will keep searching / experimenting.
Also an interesting point about positions: I moved Arbiter to the 2nd position so when Ninja died she would be boosted letting me RES much easier.
Example of Soda's stronger team on NORMAL Hydra 35.96M damage:
Soda's video: