Stinging Back
“A notorious band of outlaws known as the Redbelly Wasps is seeking to establish a new hideout near the Thousand Maws of Toto-Rak.
Once the leader is attacked, he will summon nearby allies to his aid, including powerful conjurers skilled in the arts of healing. Defeating these allies before engaging their leader will greatly increase your chance of success.— In-game description
Stinging Back is a level 20 guildhest introduced in patch 2.0. It intends to teach basic dungeon mechanics.
Guide
Redbelly Swarmpoint
In this guildhest, players will encounter groups of mobs that are standing still and groups of mobs that are roaming around.
Wait for the patrolling Redbellies to pass by before engaging the static Redbellies. Be sure to pull static packs away from the patrolling ones. When fighting the groups of Redbelly outlaws, kill or sleep the Redbelly Chanters that are wearing hats and holding staffs as soon as possible - they are healers capable of healing the other Redbellies. However, note that some of the Chanters are actually wearing hoods and holding swords & shields - these ones are tanks and cannot heal, so they should be lower-priority targets.
Redbelly Swarmpoint is the end boss of the guildhest. Periodically, he will summon adds in the forms of archers and healers. Kill the adds as soon as possible, especially the Chanter healers. If the adds are left alive, your party will face groups of healers and archers. Switch your damage dealers back to Swarmpoint, whenever you clear a wave of adds.
If the Redbelly Swarmpoint is less than 10% in health, destroy any Redbelly Chanters that spawn but it is okay ignore the rest of the smaller mobs.
Loot
Reward: 
2,030 experience, 
120 gil