AI Limit Guide | Red Deer Vs. Mercy Katana Comparison

Here's a detailed comparison between two impressive katanas

Game Guide by Ornstein on May 06, 2025

You can obtain two unique katanas from Osula in AI Limit: Mercy and Red Deer. Later, you can pick one of them up again with the Mutant Bell in Nucleus. This guide walks you through weapons' attributes, attacks, and special skills to choose the one that best fits your playstyle.

Mercy Katana

When you fully level up Mercy, it ranks A in Technique and Spirit, which means it deals the same amount of damage to all enemies. Blood Fire Walls is a special skill that lets you do extra damage. It does fire damage that keeps hurting things over time.

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Stats and Attributes

Mercy can do a lot of different things because its stats are fair. The fire element gives it extra damage over time, which can be very helpful when fighting stronger monsters or groups.

Basic and Special Attacks

Your basic attacks with Mercy form a fluid four-hit combo that you can weave into any offensive or defensive maneuver. You have two options for special attacks: a single decisive strike when you hold the attack button briefly, and a more devastating charged strike when you continue holding the button before releasing.

You can also parry incoming strikes and immediately follow up with a counterattack, allowing you to switch between aggressive and defensive playstyles.

Blood Fire Walls Skill

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Mercy's signature skill summons a circular firewall around you, dealing area-of-effect damage to anything caught within its radius. The skill propels you forward slightly upon execution, allowing you to close the distance and hit multiple enemies simultaneously.

Because the fire persists briefly before dissipating, you must time your activation carefully to maximize damage against clustered foes.

Red Deer Katana

Red Deer is a powerful weapon for dealing direct damage when fully improved to the S-tier in both Technique and Strength. You give up elemental effects to get pure cutting speed and power.

Stats and Attributes

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Red Deer excels in physical damage output, relying solely on its strength and agility rather than any elemental properties. This focus on raw power allows you to dominate one-on-one duels and shred through enemy defenses with precision.

Basic and Special Attacks

Like Mercy, Red Deer has a four-hit basic combo, but its special strikes make it strong. When you press the special attack button, you send out a quick but powerful slash.

If you hold down the button, you charge up a more decisive blow. You can reposition yourself slightly during the charged attack before releasing, giving you the precision to strike at the perfect moment against agile or grouped opponents.

Side-by-Side Comparison

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Mercy and Red Deer share the same basic and extraordinary attack structure, but Mercy deals fire damage and boasts strong crowd-control potential with Blood Fire Walls. On the other hand, Red Deer is all about pure physical strength and has higher Technique and Strength scores.

Mercy is excellent for dealing with groups of enemies because it can do many things and has a physical effect. At the same time, Red Deer's speed and unwavering damage make it great for players who like big, direct hits.

Choosing Your Weapon

If you prefer elemental effects, crowd control, and a balanced stat profile, Mercy is the katana for you. Red Deer will best complement your combat style if you want maximum physical damage, faster technique, and unadulterated slashing power—experiment with both to discover which elevates your AI Limit experience the most.

Also, check our in-depth AI LIMIT Review and other guides below: