Kimetsu no Yaiba (Demon Slayer)

Demon Slayer Abilities.
There are 3 main abilities that a demon slayer can have. Namely, The Demon Slayer Mark, The Crimson Red Blade, as well as the transparent world. Only the transparent world ability is a work in progress, and cannot be accessed naturally in survival. Only with the use of commands.

Demon Slayer Mark
The Demon Slayer Mark. Referred to as "The Curse Mark" by Kokushibo and "The Demon's Crest" by Zohakuten, The Demon Slayer Mark is an accessible ability that increases the damage that you deal, as well as reducing damage that you receive. By pressing M (Or whichever keybind you bounded the "Activate Demon Slayer Mark" keybind), and by having the "Demon Slayer Mark" Achievement, after becoming a Hashira or Upper Moon, you will be able to unlock this effect for around 5 minutes.

Crimson Red Blade
The Crimson Red Blade is an enchantment that you can get on any sword. (Except for Kokushibo's) This ability is only accessible once you complete 2 advancements. Become a Hashira or Upper Rank, AND unlock the demon slayer mark. Once you do that, you need to kill around 50 demons or more, and you will unlock the achievement. Then, you simply have to press M (Or whatever keybbind you bounded the "Activate Demon Slayer Mark" keybind to). The first press will activate the demon slayer mark, and the second press will automatically enchant your sword with "Red Sword II".

Transparent World
The Transparent World is currently a work in progress. But here is what to expect.

Only accessed by 7 people. Yoriichi, Kokushibo, Tanjuro, Tanjiro, Gyomei, Muichiro and Obanai, The Transparent world allows one to enter a sort of see through state. As of now, you need to use commands to get the effect. But once you do, you will be able to spam your attacks without any cooldown. This proves to be extremely overpowered, and the developer is trying to balance it out somehow. To unlock the advancement, you must, again, like the Crimson Red Blade, Be a Hashira or Upper Rank, as well as have the demon slayer mark. Then, you must use breathing styles around 100 times. Once you do so, you will unlock it for a split second, which allows you to attack twice in less than a second.

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