Legendary Weapons

The Legendary Weapons (伝説武器) are entities, they are the spirits of the legendary weapons that come from another world prior to being summoned. They decide the candidates to be forcibly summoned to another world to wield them. The users who wield these weapons are given the title of Legendary Hero.

They are also referred to as the Four Holy Weapons (四聖武器) and the users that wield them as the Holy Heroes, since many regions are formed centering around the weapons.

Origins
Each of the legendary weapons were from their own respective worlds. These worlds were fused together as one by the Waves of Calamity, the world of the shield and bow were fused together and the world of the sword and spear were fused together, later fusing together as one, altogether the total fusions of the worlds to three times with a total of four legendary weapons.

The role of the weapons was to fight against their original enemy, the one pulling the strings behind the scenes, seeking to destroy the worlds by fusing them using the waves. The users of the legendary weapons are given the role of safely saving the world and overcoming the waves after which the user is given a choice of three rewards.
 * 1) Return to their original world, their reward includes three wishes there, for almost anything they could wish for. The spirits can exert some influence over their user's world they operate under. The possibility of bringing back a few people with them is possible, however, that would constitute leaving early.
 * 2) Remain in the world and live out their days there, worshiped as a hero. This is the one that many heroes from the past has chosen.
 * 3) Return once to their own world but retain the right to come back here again.

Summoning & Selection
The legendary weapons are not always able to summoned their first choice of hero. In fact, only the Shield Spirit is known for always summoning its first choice of hero. The Sword, Bow, and Spear Spirits often can't summon their first-choice hero in the first place or their hero dies quickly after summoning. If summoning fails, they have to summon backup candidates who have serious character problems. As a reward, these candidates have their deaths corrected.

The legendary weapons are summoned to the response of the waves, appearing in a set of unique weapons, usually four in total. The summoning rituals will also select people from other worlds to wield these weapons; in Naofumi's case, he encountered The Record of the Four Holy Weapons while browsing the library. Once a Legendary Hero is deceased, their weapon will disappear in wait to be summoned again with a new hero. The weapons can be re-summoned if either the current set of waves is vanquished, or the set of weapons is expunged. With each weapon missing, the waves are said to grow stronger.

Abilities

 * See also Vassal Weapons

Legendary Weapon potential is superior to Vassal Weapons, but have more restrictive functions.

All weapons possess a gem that acts as the functional matrix to activate abilities, this gem persists through transformations. They specialize in protecting the world they reside in. They upgrade through adventuring within their respective worlds, with each world having different power metrics.


 * Bypass
 * No level cap and no class-up requirement.
 * Immunity to slave seals and other control type curses.


 * Restrictions
 * Possessors of the Legendary Weapons are unable to gain experience when in close proximity of each other.


 * Possessors may not equip weapons that are not of the same class as the Legendary Weapon itself. Additionally, possessors cannot remove the Legendary Weapon from their bodies.


 * SP Energy
 * Possessors of the Legendary Weapon have access to a hero-exclusive energy called 'SP'. This energy allows heroes to use skills unique to their weapon and is an independent system from magic and life energy. SP can either be regenerated over time or by consuming soul-healing water.
 * Translate
 * Verbal language is translated to the user in their primary language while the user’s primary language is heard by the recipient in their primary language.


 * Wave Summon
 * Upon wave spawn, the Legendary Heroes and their respective parties are transported to close proximity of the Waves of Calamity.


 * Drop Items
 * Upon defeating an enemy, there is a chance that it may drop special items unavailable to non-Heroes. Drops may include weapons, armor, crafting materials, and monster parts.

Authority
 * Tech Skill
 * If the hero has a recipe, they can place the ingredients in the weapon's inventory and use it to automatically craft the desired item with some time. However, only drop items and items created by the hero can be used for crafting.
 * Possessors of the Legendary Weapon have the authority to dismiss a Vassal Weapon Holders of their Vassal Weapon if they are neglecting their duty or using the weapon for malice purposes.

Strengthening Methods
Weapons have various strengthening methods that are selectively revealed to the user's interface upon assignment. Other users can enable these systems only if they genuinely believe they exist. Learning from other users will provide bonuses to both. However, power-up methods from different worlds will not work.

Universal

 * Absorption: Weapons can absorb loot such as items and materials to unlock new variations of the Legendary Weapon and may equip said variation if they meet its prerequisites.


 * Weapon Transformation: Weapons can transform into different variations that grant new equip bonuses including stats, skills, and abilities. Additionally, with enough experience or other prerequisites, the user may permanently retain the equip bonuses even if they switch transformations. (Some bonuses remain exclusive.)


 * Weapon Copy: The user can copy weapons of a similar class to the Legendary Weapon that they encounter and store them for later access. Equip bonuses may still require materials to unlock.

Raphtalia's World

 * Mastery:  Using the same weapon would improve its stats up until it is fully mastered. This power-up method was first available to the Legendary Sword hero.


 * Energy Transfer:  When you have gained mastery in using a weapon, you could reset its mastery level and release the amount of energy you had invested in it. Finally, any items that you had absorbed into the weapon could also be turned into energy. This power-up method was first available to the Legendary Sword hero.


 * Increasing Rarity: By imbuing a weapon with energy gained from resetting mastery levels, you can increase its rarity level and the weapon’s abilities. A weapon's rarity can be repeatedly increased starting at common (C), then uncommon (UC), and so on. This power-up method was first available to the Legendary Sword hero.


 * Smelting:  You can power up a piece of equipment using ores. There is a chance of failure. This power-up method was first available to the Legendary Spear hero.


 * Spirit Enchantment:  Pieces of monsters' souls that have been absorbed into a weapon can be used to imbue the weapon with special powers. This has no chance of failure-maybe. This power-up method was first available to the Legendary Spear hero.


 * Status Enchantment: Stats can also be increased by absorbing items dropped from monsters. This power-up method was first available to the Legendary Spear hero.
 * Power Up:  The power of a weapon can be raised by equipping it with certain ores. This never fails. This power-up method was first available to the Legendary Bow hero.
 * Item Enchantment:  Items that have been absorbed into a weapon can be turned into energy, and that can be used to raise the percentage of various stats. Success is based on probability, decreasing with each successive enchantment. Upon failure, the item enchantment level is reset to 0. This power-up method was first available to the Legendary Bow hero.
 * Job Level:  You can increase specific stats by using the energy contained in absorbed monsters or items. Upon filling the level gauge for the desired stat, the stat is increased and the level gauge is reset with a cooldown timer. This power-up method was first available to the Legendary Bow hero.
 * Sharing:  Share the power-up methods from other legendary weapons and vassal weapons. This power-up method was first available to the Legendary Shield Hero.
 * Trust:  Trusting and being trusted leads to increased abilities. This power-up method was first available to the Legendary Shield Hero.
 * Energy Boost:  The heroes have energy called "EP" that they draw out automatically as power from the weapons, and this is always active. Assigning this energy to skills will allow more powerful skills to be used. This energy is like a combination of SP and life force and is eventually required to learn Liberation-class magic. This power-up method was first available to the Legendary Shield Hero.
 * Power-Up Points:  Points were acquired based on your current level, and they could then be spent on magic (Staff) or skills (Gauntlets)  the restriction to this power-up method is that the heroes must be working together for this power-up method to work. This power-up method was first available to the Seven Star Staff hero and the Seven Star Gauntlets hero.
 * Enhanced Customization Via Money:  You must spend money to enhance yourself. It only works when combined with other power-up methods. It also cancels out failure at refinement. This power-up method was first available to the Seven Star Projectile hero.

Glass' World

 * Experience Points:  By using a weapon, it gains experience points. As the weapon levels up, it gets stronger. This power-up method was first available to the Legendary Hunting Tool hero.
 * Ofuda:  Pieces of paper can be attached to the legendary weapon in order to add different functions. This power-up method was first available to the Legendary Hunting Tool hero.
 * Magic Residue:  Once the enemy has been defeated, the legendary weapon can absorb its magic power or any magic residue in the air. This magic power can then be used to power up the legendary weapon. This power-up method was first available to the Vassal Fan hero.
 * Refinement: Successful increasing the refinement will increase the power of the weapon and show a plus beside the name. This can be done multiple times but there is a chance of failure. The power-up method was first available to the Vassal Katana hero.
 * Spirit Enchantment:  Similar to the power-up method from Raphtalia's world. Pieces of monsters' souls, or items, that have been absorbed into a weapon can be used to imbue the weapon with special powers. This power-up method was first available to the Vassal Scythe hero of this world.
 * Item Boost: Items held within the legendary weapon provide bonuses based on what the item is. This power-up method was first available to the Vassal Boat hero.
 * Enhanced Status Via Money: Similar to its counter-part from Raphtalia's world but instead of providing enhancements and cancelling out failures with money, the user can buy status for cash. Statuses like +1 to magic, increased maturation rates, or magic recovery speed can be bought. This power-up method was first available to the Musical Instrument hero.
 * Food Level: Eating food increases a food level gauge that is different from regular levels. Levelling up causes statuses to increase. Different food changes which statuses are increased. This power-up method was first available to the Vassal Mirror hero.

Curse Series
Legendary Weapons respond to the user's strong negative emotions caused by heavy emotional or physical strain and traumatic events, unlocking the Curse Series variant related to said emotions.

The Curse Series grant powerful effects, stats bonuses, and abilities, but a severe penalty which scales to the severity of the Curse level is applied to the user when the variant is removed or its skills are used.