Pill Bug

Pill Bug is fishing tackle.

Source
Pill Bugs can be purchased from vendors or obtained as a quest reward.

Vendors
Pill Bugs can be purchased for from the following vendors:
 * Admiranda - Old Gridania
 * Evrardoux - The Pillars
 * Junkmonger - The Goblet, The Lavender Beds, Mist, Shirogane
 * Merchant & Mender - Middle La Noscea
 * Syneyhil - Limsa Lominsa Lower Decks
 * Yoyobasa - Ul'dah - Steps of Thal

Quests
Pill Bugs can be obtained as a reward from the following quests:
 * The Beast of Brewer's Beacon

Uses
Pill Bugs are used in fishing the following items: