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.

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. The seven known curse series are wrath, greed, gluttony, pride, lust, envy and sloth.