The ranking system in Cursed Revenant are ranked by physical power along with how deadly an innate technique is, and the skills the user has created.
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Low Tier Rankers:
E Ranks have little power and potency when it comes down to their base stats. Innate techniques are rather mundane, and mediocre. Their power can typically range from destroying a stone wall, to maybe a small house. Most skills are weak and pathetic. Not even a weakling could be favored amongst the other bottom feeders.
D Ranks have the basics down to a somewhat acceptable level, but their ultimately shutdown cause most moves lack depth and consistency. Their power is around the size of a medium-sized building. But their skills are below average, some would even consider them to be below most average revenant users.
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Mid-Tier Rankers:
C Ranks are reliable, competent, overall, a useful fighter. Their techniques are basic, simplistic, consistent, and have more depth than most. But they're average at the end of the day. They're power is enough to level multiple city blocks, and their speeds can move up to supersonic speeds.
B Ranks are better than average revenant user, mainly for the better innate techniques they are born with. Along with more advanced skills that give them more of an edge in battle. Their power can almost destroy a large town, and they can even move up to high speeds that travel up to Mach 20.
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High-Tiers:
A Ranks are elite level fighters. They have the skills, power, battle intelligence, and even the complex fighting styles that are hard to breakdown. They know how to exploit clear weaknesses in their opponents, and even keep their own weaknesses hidden in the midst of battle. Their destructive capabilities are able to level entire cities and even move at around much faster than hypersonic speeds. Their well-oiled fighting machines that are smart and powerful. You are not only need to be strong, but smart and tactical.
S Ranks are exceptional users. Their powers are complex, dangerous, and are in a completely different realm of strength compared to others.
Captain Ranks are commanders of strength, authority, and skill. Their even stronger than any kind of S Rank. Even amongst most highly gifted warriors, Captain Rankers are considered to be in a league of their own. Captain Rankers are also the highest rank to be earned.