|Smuggler's Den is in Southern Fouls Hills (1740,880).
The instance itself was made for players from level 90 - 150 but there is no lock.
Loot from normal monsters
The Den Mantises are partially tightly packed. Especially lower level players should step carefully and/or bring a calmer to the instance. A few mantises (e.g. Den Mantis Earthmelder) are capable of casting nanos of about their level, including debuffs on players.
The Den Mantis xxx can be found with different names:
These parts can be used to make the Metallic Mantis Armor. The QL range of these pieces goes from about QL75 to QL140, with some rare exceptions being lower/higher.
Another possible drop is the Mantis Predator Blade, which also comes in different QLs, peaking out at QL120, though.
There are also some profession NODROP items to be found:
The Prothorax (Soldier) drops only as QL100, everything else varies similar to the armor pieces in the range from about QL75-140.
Den Mantis Breeder is located in the same room as the Mantis Queen.
The Smuggler xxx can be found with different names in the instance.
There are mutants, beasts and a leet here as well.
The Den Smuggler Pilot dropps also
. It's one of bosses in this instance and he respawns 25 minutes after he is killed. He usually drops Spirit Focus and Notum Focus, sometimes both, the drop is not 100% so you may have to kill him more than once. Be aware he has a poison DoT (damage over time) nano he uses sometimes. He also drop 2 kinds of meele weapons.
Den Mantis Queen
Unless you're level 210+ it's best to not solo this boss.