Sting Your Praises - Lestallum
First Available: Chapter 3
Other Requirements: Complete Tails Spin
Rewards: 4,000 EXP & Additional discounts at merchant
In order to accept this quest from the Arms Vendor in Lestallum you'll need to first complete the story quest, "A Stroll for Two" in the city. Once you've completed this quest, all of the available side quests in Lestallum become available. Note: If you're having trouble accepting the quest from this NPC, you actually have to interact with the counter in front of him and not the NPC itself to accept/turn in these quests.
For this quest you will need to travel to an area north of Lestallum, which is marked on your map. Here you'll have to defeat some Saphyrtail enemies for their stingers
Completion of this quest will reward you with even more discounts from the arms merchant in Lestallum. This is also the final quest in his chain.