Close up of Rifle
Chambered in .44 caliber cartridge and modified with a unique crystal handle. This repeating rifle is the signature weapon of Adrian Day, able to channel both spirit and magical energy at the same time. Built by Mistral industries (whose offices are located in Skyhall) hence the detailing.
Quick edit: Yes that is in fact an oracle bracelet on his wrist, I just made it look cooler than in game imo.
headcanon explanation, because I can't stop using art to yap.
Basically I like to think that certain powerful legacies, such as the AO MC, are able to act as anchor points for the Olympians’ scattered spiritual essence. Adrian being a descendant of Athena is one such legacy, as seen by her helping to guide his aim.
I also like to think that having certain curses while being a legacy may allow you to anchor a deity you aren’t strictly related to. For example Morden, in my fanfics, will act as an anchor for Thanatos despite being a legacy of Hypnos.
references
Athena’s design had inspiration pulled from various artist in the Epic: the Musical fandom.