So, you are looking to visit Droga? There are many places to go inside Droga and many many goblins to kill. This zone has one-way entrances and exits. Entering either from Frontier Mountains or the Mines of Nurga will commit you to traveling through much of the zone in order to depart. The entrance from Frontier Mountains leads to a room with a hidden pit (on the right as you enter the first room).
The monsters you will face:
Boredom
Greed
The late arrival without a map
The mage/wizard classes of goblins are: Adepts, Firedrowser, Flamedrowser, Flashdrowser, Legate
The necromancer classes of goblins are: Bonecharmers, Blightcallers, Boneseers, Plaguebringers
The cleric/shaman classes of goblins are: Dirtcallers, Dirtracers, Dirtscribers, Fanatics, Soothsayers, Stonechanter, Rockchanter
The Shadowknight classes of goblins are: Mosstroopers and Stalagknights. Harmtouches for 311 to 351.
The rogue classes of goblins are: Backbiters, Slinkers
Chief Rokgus is a warrior
Soothsayer Dregzak appears to be a cleric/shaman
A Goblin Traitor is a quest NPC needed for Chardok based quests (spawn time about 2 hours)
an Angry Goblin is a quest NPC needed for Chardok based quests (spawn time about 3 days)
Warlord Skargus is a triggered mob for Chardok based quests (hand in report to angry goblin, follow the goblin who despawns at the warlord), harmtouches for 811.
If it is not mentioned, the rest are warrior types
I place boredom and greed at the top of the list since the results of those 2 have been known to break up guilds. While blame was placed on a bad raid in Droga, the events inside merely were the way that these 2 factors burst into the scene. There are literally 5 items in the zone worth 1000s of plat, and it may take hours upon hours of mindless goblin killing to obtain them. During that time, many folks will have a hard time focusing on what can be obtained there. When folks start to get unfocused and wander around, make a hard decision to stop the raid and leave the zone. If you will be passing through the region that either of the valuable items drop, decide before entering how they will be distributed. At the time of writing this, Idols of the Thorned are still selling for about 10,000pp, and Shrouds of Nature about 3,000pp.
All goblins run when they get to 1/3 health. Either be able to kill them so fast they cannot run, or snare them all by 1/2 health. Snare too early (like on the pull) and you may have all the aggro until it tries to run.
With few exceptions, goblins are on a 15-18 minute spawn timer. It has been observed that there are 3 warders up at one time, so it is likely that the warder is the uncommon pop from any goblin in the Goblin City area.
Harmony vs Lull. This is a dungeon, so I believe that harmony cannot be cast here. Lull, the cleric / paladin version of the spell can be cast here, but I seem to have bad luck using it (like, why bother, I get them all most of the time anyway).
Faction
There are 2 factions involved in each kill here. Mount Death Clan is the faction of the goblins in Droga, Nurga and Frontier Mountains. Brood of Di'Zok is the faction of the sarnaks inside Chardok. There are a few creatures on the Brood of Di'Zok faction outside of Chardok, most noticably the goblin traitor (once you get to warmly, he will respond to hails) and the angry goblin. Achieving the faction necessary for the chardok quests appears to take the following number of goblin kills: 2000 + (5 times the number of sarnaks you ever killed) + (100 times the number of times you assisted killing the queen in chardok) + (about 500 for being iksar), with a maximum of about 4500. Now is the time you start to regret hunting sarnaks in Lake of Ill Manners.
Recommended groups
For upper 40s to 60: you can probably solo this place. Having 2 folks in the group will almost guarantee survival.
For mid 40s to upper 40s: One group of 6 should be sufficient to visit any place in the temple. You will need 1 healer, 1 snarer and 1 evaccer.
For upper 30s to mid 40s, a strong group, or maybe 2 groups can handle most areas.
For lower 30s to mid 30s, plan on 2 groups, each group must have evaccer, and 1 rezzer for the raid is essential. Someone who can sneak or FD and drag corpses to the zone for rezzing will be greatly desirable.
Quests
There are a few quests involving this zone:
Iksar shackle of steel
Iksar shadowknight weapon
Chardok Faction: every kill raises Brood of Di'Zok. Turning in Green Goblin skins and Mt Death Salts raises Brood of Di'Zok faction (and the Sarnak collective faction, this is the only way to raise SarnakCollective).
Chardok Faction quest
Chardok Rings