Mordrek hole
"This cavern is one of the most dangerous places in the world. Inside the network of passages that make up this cave system is full of various kind of toxic mushrooms that infest the air with deadly spores for any creature without the necessary strength to withstand them.
It is the home of Mordrek. He and his offspring spread these mushrooms all over the place to wipe out or weaken any enemy that wanted to enter their domain and be able to easily finish them off. In addition, the thick air along with the high humidity and extreme heat of the place make it a naturally hostile place, although for the bug race that once lived there, it was a paradise.
When Mordrek was defeated by the arboreals, it was chosen to leave him in that very place place to keep any intruder from disturbing the deep sleep to which it was put. Only those with a great level of fortitude can enter the place, although they must do it quickly, staying longer than necessary would be deadly for anyone."
Mordrek Hole is a new map added to the Lineagedos project. It is a hidden, dark and wet place that hosts new insect like creatures and a RaidBoss called: Mordrek, the ravager (lv.55).
The only way to reach Mordrek Hole is through Kebum, the arboreal, that you can find in the temple of Kalanthia Island. Only those characters level 50 or higher who have completed or are already in the middle of the Chapter 7: Into the Hole lore quest will be able to travel there.

Kebum, the arboreal
Kebum location
As soon as you reach Mordrek Hole, you will find yourself in a hall next to a NPC named Hunfrid Dhotdruk, of whom we will talk later, as well as a corpse on the floor a little further, from which some unpleasant fumes emanate. And this is a hint of the first map feature. After passing the huge gate that separates the hall from the place where you will find the mobs, you will experience an illness called Modrek's Hole Poison, a debuff that reduces P.DEF, M.DEF, P.ATK and M.ATK by 10%:

Hall
Mordrek's Poison
Of course this is not the only threat in this place. You will encounter four types of creatures, all of them aggressive, very tough and with x4 health. All of them are mobs that roam alone except Mordrek Larva, which is a group of 3 who help each other.

Tentacle
Giant Captain Earwig
Giant Soldier Earwig
Mordrek LarvaEvery mob grants a nice amount of XP and SP considering its strength. And of course they give adena (3.000~4.500) as well as a special item called
Green Nacre(5%) that you can only find by killing Giant Soldier Earwig, Giant Captain Earwig, Tentacle or Raid Boss Mordrek, The Ravager himself.
Green Nacre is not tradable and cannot be sold in ordinary stores, but you can trade them for Silver Coins with Hunfrid:

Hunfrid Dhotdruk

Hunfrid multisell x1 Green Nacre | x1 Silver Coin |
ExchangeEvery time you exchange
Green Nacre with Hunfrid Dhotdruk, he will tell you how many items you have exchanged so far and how many remaining objects you will still be able to trade. Yes, there is a limit to trade Green Nacre for Silver Coins: 200 units corresponding to 200
Silver Coins. Once you reach the limit Hunfrid will no longer exchange any more items and Kebum won't let you go back to Mordrek Hole:

Green Nacre limitFinally on the map you will find Mordrek, the ravager, a level 55 Raid Boss. In order to defeat him, its necessary to be in a party:

Mordrek, the ravagerAlong with the quest item required to finish Chapter 7 from the lore (
Mordrek's Eye), by killing Mordrek you will also get
adena(100%)(2.300.000-3.700.000),
Green Nacre(100%)(5-20),
High Grade Life Stone lv. 58(20%)(1) and
Top Grade Life Stone lv. 58(10%)(1).