Legendary Core

Legendary Core is an exclusive, special type of Fusion Core that can be used to instantly max out any mods without Credit costs.

Legendary Cores can be sold for and be traded for.

Acquisition
During Update 12.2.0, two of these cores was distributed to players with the change in number of ranks for Steel Charge, reducing the max rank of 10 to 5 as a compensation to people who had leveled their Steel Charge beyond Rank 5.

This mod is currently exclusive and there is no way to obtain one as of now.