Azriel was on foreign land, which was particularly dangerous, since that land was filled with any shadowsingers' worst enemy, lightsingers. Luckily, he wasn't alone, he was joined by two other males: Rhysand, the High Lord of the night court, and Cassian. While in the forest, they had spotted a female lightsinger, but she was not like any other lightsinger, she had no wings, which was particularly peculiar, considering all lightsingers had white wings. But she also had five black strips on her. 4 on her face, two on her cheek bones, and another two right under her eyes. And a long, horizontal one on her neck

Cassian: "What the heck are those?" he whispered to Azriel and Rhysand from the tree they were hiding in

Rhysand: "Light and Shadow are opposites, so when two people of opposite sides fight, the wounds are permanent. That line on her neck, means a shadowsinger wounded her neck, possibly trying to slit it. The ones under her eyes, symbolize how many mates she's had. Considering they're also black, probably means her mates died by torture by Shadowsingers, and since they're under her eyes, that placement symbolizes that she's seen it all happen right before her eyes"