"Alright! Our own Peace Maker! Now we're rockin'!"
― Daxter after he and Jak aquired the Peace Maker. (Jak and Daxter series)
The ability to scientifically or supernaturally enhance existing weapons. Sub-power of Weapon Manipulation
The user is capable of enhancing the performance of any weapon by supernatural or scientific means in order to make them stronger and give the new and/or greater powers. The weapon may have added material to make it less fragile and more durable, or enhanced features to make them more powerful.
The Pack-a-Punch (Call of Duty series) allows weapons to be upgraded to better versions of themselves, giving them attachments, increasing damage output/magazine capacity, grating added effects, and/or more reserve ammo, etc.
Frank West (Dead Rising/Dead Rising 2) can make some weapons to kill enemies more efficently
Chuck Greene (Dead Rising 2) can invent some deadly weapons so he could kill his enemies more easily
But neither Frank nor Chuck had made some crazy weapons as Nick Ramos (Dead Rising 3). His mechanical skills can turn even the most harmless toys into deadly weapons.
Jak's Morph Gun (Jak and Daxter series) is capable of being outfitted with numerous upgrades that allow it to possess several eco mods with weapons for each, as well as increased ammo capacity, damage output, and rate of fire.
Mario & Luigi (Mario & Luigi: Superstar Saga) had their hammers reforged to break harder rocks.
Mega Man X's (Marvel vs. Capcom: Infinite) X-Buster was upgraded by Iron Man into the Infinity Buster, a massive cannon powered by the Infinity Stones, in order to destroy Ultron-Sigma.
The Light Capsules (Mega Man X series) are inventions of Dr. Light that give X a part of his many armors that upgrade his abilites. Some capsules also give X a full armor, chips that enhance the power of the current armor, or a secret technique.
For example, X's (Mega Man X series) First Armor allows him to dash on the ground and in their air, increase his resistance to damage, and fire a more powerful Charge Shot.
X's Fourth Armor increase the power of his body and weaponry, and also grants him the Nova Strike ability.
In his Ultimate Armor, X possesses all of the enhancements provided by the Fourth Armor with much greater power, and can use the Nova Strike for an unlimited amont of time.
The Dragon Sword (Ninja Gaiden) can be upgraded as well being infused with the Eye of the Dragon.
Rachet (Rachet and Clank series) is able to use the Nanomites he gathers from defeated enemies in order to upgrade the strength of his weapons.
E-102 Gamma's (Sonic the Hedgehog) upgrades include a laser blaster to lock onto more enemies and a jet booster for hovering.
The Ancient Light (Sonic Adventure series) allows the characters to posses various power-ups for certain levels.
Nightmare (Soul Calibur) wields Soul Edge which was a normal sword before bathing it in the blood of countless victims. Because of this it becomes stronger when it comes in contact with blood.It can also restore its strength with every shard of Soul Edge found.
Spyke (Splatoon) can increase the amount of sub-ability slots a piece of gear has in exchange for gold or Super Sea Snails (sitting next to him in this
The Master Sword (The Legend of Zelda series) is Link's most trusted weapon. Even in its final form, its power can be increased by smithing or magical means…
…in some cases, resulting in the Tempered Sword, and the Golden Sword, doubling and eventually quadrupling its power.