Whats... the relic?

A relic is an ancient object with divine power from the church. There are very few of them. One of them was the necklace that he made Physche wear when he wanted to steal her healing power as she died (through the necklace) But Medea was in her body and fought off all those assassins. The small orb-shaped relic in that guys mouth. I assume it would drain someones life energy if they were to bite down on it. So Eros used it as a way for his assassins to kill themselves if they were ever caught.