Red/Crimson Nichirin Is unlocked by getting 1000 contribution.

Contribution and buying the key, there is no rank required and no stats required.

You need to go to the Slayer HQ,The key is in the table and is colored red with small particles in it, and it is also right next to the 'See Through World ' Key. If you have 10000 Contribution a prompt will show up asking "Do you want to buy ???? for 10k Contribution?"

If you say yes, a key named "Infinity Key" will be placed in your inventory. If you do accept the key, it'll will teleport you to a room with the Upper Moon 2, "Douma".

"Douma" inside, after you defeat the boss, It will say " 'My Blade..' Press T", and when you press T you get your Red/crimson Nichirin.

The Red/Crimson Nichirin Increases your overall damage by 1.5x, but it can't be stacked with the Demon Slayer Mark. The Red/Crimsion Nichirin has an active duration of 40 seconds, and a cooldown of 2 minutes. This cooldown is also reset when your character is kill/reset.

The Red/Crimson Nichirin reduces demon regeneration by 50%.

If you want to defeat Douma with a friend, you can’t. If you and your friend use the key, 2 ‘Doumas’ will appear, both attacking the nearest person.

Activating this unlocks special moves for Kamado members, named Hinokami Kagura, also named Breath of the Sun.

Tips for killing Douma[edit | edit source]

  1. You should left/right dodge after you launch an attack since Douma will launch the ice attack after you hit him with forms like Flame Breathing 2nd Form or Thunder Breathing 2nd Form.
  1. If you're low just keep running.
  2. Get your hunger bar at least a half before entering the battle.
  3. Start with m1s at the start of the battle.
  4. Run around him , and attack with m1s, after you are finished run around him and then repeat, you can also use some moves while doing this, but make your you run as fast as you can when your move is finished. 6. You can easily kill with any rank and thunder breathing just run and spam thunderclap.
  5. Keep walking around and hitting him, doing this the boss doesn't hit you and it is rare for him to use skill, you will chee se the boss, not needed an HYPER rank, it is not the fastest method but the most safe
  6. When low on hunger or HP, keep running and throwing in some 1st forms or something to slow Douma down.

7.You need to not use breathing and just run around him.

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