Ign is Rhythm again. ;D
Battleship is a style of dungeon very similar to the much anticipated gargoyles. You enter through speaking with an NPC, and it consumes energy (just like Aramitama). I'm not sure about the length of the dungeon, but the primary focus is the boss fight, and there are multiple variations of the boss, which all have different elements. Like gargoyle, they also drop mats for weapons. That said, I'm not really sure how strong these bosses are, nor the level of the gear that is crafted from them as I don't actually play on the JP server, and such data is not included in the patch notes.
Pre-moon patch its "Tsuki Zenpen." It was mentioned before, I just basically engrished it. The islands are a part of this patch.
Oh I forgot to mention, there is now a third type of dungeon similar to gargoyles/ships that's being added. Well, maybe, considering they only added one so far, its called a Kojinzou.
