Trace

Out of seemingly nowhere, artifacts begin to appear at random places in a city, that once found and equipped, give the wearer super powers, a suit, and essentially a new identity. Whether technology, or magic, these objects all give amazing abilities along with turning the user into their top physical form, allowing for further amazing feats of strength, speed, agility, and durability. All items connect directly to the person's mind, giving them a companion to guide them along their new path, and assist them with their powers.
The purpose of these artifacts, according to the companions, is to destroy other artifacts and absorb the sources of their power, called Trace. Upon the destruction of another artifact, there Trace can be taken, increasing the own user's capabilities slowly over time. This means, most users are on the hunt for others, in order to lay claim to the Trace they find so valuable.
But, as it is said, absolute power corrupts absolutely, and many people who discover their new abilities are not capable of handling it, becoming corrupted versions of themselves, or simply turning an already villainous person, into a potential monster. The Trace feeds into the person's ego, their lust for power, their wants and desires, and gives them the capability to take what they want. Only two wielders of these artifacts are currently known by the public, quickly becoming heroes who stop attacks by corrupted artifact holders; Chrona, and Masquerade.