Available only to Artificers using the Arcane Assault Armor. This feet allows you to copy any 3 weapons and store them in the suit's memory, when entering combat, automatically construct a weapon of your choice, at the start of each round use can use your bonus action to switch between the three weapons you have copied. Their carry weight of those three weapons is also ignored.
The suit's memory holds exact copies of the weapons you have chosen, this includes any infusions, modifiers and traits, copied weapons knocked out of your hand will deconstruct once they reach 120ft from the suit, that copy is considered corrupted data and can not be selected until copied again, the same applies if the weapon is destroyed.
You can attempt to repair the corrupted data using Tinkerer's tools with an Intelligence DC of 15 but only once for that slot as the suit will shut you out on a failed attempt.