Lucifer Season 2 Episode 5 was titled "Weaponizer."
As for what took place on this installment of the Fox drama? Scroll down to watch Lucifer online and also to find out the answer:

Lucifer investigated the killing of his favorite action movie hero this week, someone whose longtime rival was one of the initial suspects… until evidence proved otherwise.
Don’t you hate it when that happens?
Meanwhile, Uriel appeard, forcing Amenadiel to admit he’s lost his powers. Later on, Lucifer and Uriel battled over Chloe and their mother.
For more on what went down, click on the video above to watch Lucifer online.