Talk to Halshaob again and ask for details on the quest he wishes you to perform.
To accept the quest, trade him the amount of currency that he specifies. To accept this quest, you will first have to trade him 3 Imperial Bronze Pieces.
You may start the quest once every Earth day. It is possible to go twice in one day if you have started the quest on a different day than you failed. You must come back and restart the quest every time you want to attempt it, win or lose.
Caution: You will aggro the NMs if you engage them with /attack. Do not engage if you do not want aggro.
Inside, you face waves of Ashu Talif Crewmen (Fomor RDMs, MNKs, and RNGs). All die quickly; however, if their attention is focused on a single player they can become overwhelming.
Most enemies in this battle have around 600 HP.
AoE weapon skills and spells are extremely effective.
Reraising anywhere except the upper levels of the area causes blood aggro.
After ~27 Crewmen, an NM imp named Swiftwinged Gekko appears in the middle of the lower deck. This imp casts a single spell (Bindga, Graviga, Paralyga, Sleepga), flees to the rear of the ship, and vanishes. Try to deal as much damage as possible in the short time it appears. It can be Stunned to buy more time. Defeating it does not end the quest, however. Beware his habit of casting Sleepga then vanishing, leaving the next wave to manaburn you if you are on deck.
When it is gone, waves of Watch Imps will appear that cast Ancient Magic on the closest target as they spawn, although like the Ashu Talif Crew, they die quickly.
Now both Imps and Crew will attack simultaneously. Take care to not be hit by the Imps' Ancient Magic while shadows are down from the crew's attacks. Swiftwinged Gekko will also appear from time to time. At some point during the fight, you will be resupplied with items again.
When Swiftwinged Gekko appears among a wave of normal pops, you are on the last wave. This wave is particularly dangerous, as Gekko's spell will wipe all shadows just in time for the Watch Imps to finish casting their Ancient Magic.
Once the waves desist, an Ancient Lockbox will spawn. One will appear for defeating all enemy waves, and another for defeating Swiftwinged Gekko. Cast lots on the treasure pool if you desire, and choose to leave the ship by clicking on the Lifeboat where you entered from. If you fail to click the Lifeboat before time runs out, you will not receive credit for winning.
Possibly a ??? Box that can be appraised to a number of items.
Various gemstones and beastcoins. Breakdown currently unknown, and all attempts to group items are foiled by future runs. It is known that more than one type of beastcoin can drop in one run; that Black Pearl, Pearl, and Star Sapphire can all drop in the same run; and that Chrysoberyl and Topax can drop in the same run. The columns do not reflect drop categories.
Because this is treated in every way as an Assault (no battlefield status, fireflies temp item, etc.), it is very likely that drops are not categorized like in BCNMs.