The final piece is Amenadiel's necklace, which he has worn for millennia.
While Episode 11 focuses on the "miracle" reveal, the broader story of Season 2 involves Lucifer, Amenadiel, and Charlotte trying to assemble the to storm the gates of Heaven. Lucifer S02E1143:15 Min
Only Lucifer, as the "Lightbringer," can ignite the sword using his inner emotions (specifically his pain and anger). Lucifer Season 2 - Martin Stellinga The final piece is Amenadiel's necklace, which he
Two women whom Lucifer recently slept with are found dead. This forces Chloe and Lucifer to interview his long list of past "paramours," leading to a series of awkward and comedic encounters as they search for a common link between the victims. The final piece is Amenadiel's necklace