I've just noticed how similar Ap'lek's mask is to the Sith Warrior Adraas one from SWTOR. Probably a coincidence, but it would be cool if Ap'lek repaired and wore an old artifact. :
Ever since I got this mask, I never took it off. This is art and menace in one. : r/swtor
SWTOR Dark Side Sith Inquisitor Story #9 Killing Lord Khreusis & Taking Kallig's Mask - YouTube
Headpieces, Helmets and Masks in Star Wars: The Old Republic - Swtorista.com
Sith Acolyte Armor Build | Mynock's Den | Taras Harkavyi