Captured Firefly

The Captured Firefly item teaches you how to summon a Firefly companion.

Source
This item is an exceedingly rare drop from Bogflare Needlers in Zangarmarsh.

It can also be listed on the Black Market Auction House by Breanni, for an opening bid of.

Pet Journal
Commonly used by sporelings as a light source as they navigate the waterways of Zangarmarsh, this luminescent insect helps them avoid the dangerous bogflare needlers.

Notes and trivia

 * It once had the flavor text "Still flying...", a reference to . After a terrible day, the captain of the titular ship observes, "We're still flying."
 * The drop rate of this pet is roughly 0.1%, or one in every thousand kills. Due to their rarity, they can sell for fairly large amounts of gold on the Auction House. The table below shows the cumulative probability of getting at least one after a number of kills.