Karon the Gatekeeper

• Korean Name: 문의 주인 카론
• This is a Boss in  The Archmage’s Hall of Dimensions, a Legion Dungeon in level 110 cap.
• Third row is his weakness. Forth row is Elemental Resistance. Fifth row is Aliment Resistance. The second picture is transcendent difficulty. Credit to Pata from GBL Discord Server.

The Law of the Underworld Gimmick

• Each player will have a soul gauge next to them. If this gauge fill up, Karon heals 20% HP. If everyone have their gauge fill up, Karon kick you out of the underworld and you have to redo.

• To reduce soul gauge: Hit the flowing green soul on the map. It will take you to another dimension. There you need to dig up the grave. This tombstone will absorb and reduce your soul gauge.

• NOTE: There are other grave site in the map, make sure you dig up the one that have light coming out from it.

• There are various kind of tomb you can dig up. When the tombstone fully appears, Karon's neutralization gauge decreases by approximately 6-7%. Different ghost will be summoned to attack you once the tomb fully absorb your soul gauge. They will also give you various buff. 
• Kazan ghost will do y-axis wide attack on each side. His attack is slow and easy to dodge. He gives you 10% damage increase

• Hazy-Eyed Bremen ghost will do 3 ghost waves. Just jump to dodge. He will give you 10% defense increase.

• Keiga ghost will do slashes across the x-axis. They have small y-axis range. He give no buff.

• Cold-Hearted Saya ghost leaves her sword on the ground. The sword cause frost on the map and explode except for the safe zone around the sword. She gives no buff.

• Plague Rhasa create small ghosts that activates other tombstone. As you can see, no tombstone means no soul gauge reduction. So kill those small ghosts quickly.

• The last ghost simply cause damage around you. This damage zone follows you so it won't be a problem in solo play.

• Beside this gimmick, Karon fight is pretty much dodge his attacks. If you see the lines, time yourself and dodge.

Phase 2

• Soul Zone Pattern: He create a field of soul that slow you down. Staying this zone will drain MP and field of vision. Your job is to stay outside of this field until he finish his pattern. If not, then instant redo. There are 3 zone variations, top/bottom, right/left, and circle.

• Soul Rain Pattern: Activates at 40% HP, Karon do lots of slashes then soul from the sky. Just dodge them

Transcendence Difficulty

• Karon will after phase 3 in this difficulty. He start with teleporting to the top, and absorb tons of soul. The more souls you can block him from absorbing, the lower HP he will start with (up to 30%). In this phase, he still do lots slashes but are more enhanced, so careful to dodge those.

• Soup Rip Pattern: If you see your soul got ripped out, retrieve it quickly.

• Next Step Pattern: This activates at 40% HP, he cause explosion around the map and then rip your soul out. You must retrieve the soul quickly. At the end of pattern, there are explosion around the map, the safe zone is either left or right.

• Advent Pattern: When the transcendent gauge hit 100%, you get kicked out and have to refight the boss.

References

Namu.wiki

GameChosun

YouTube - 히카리타마

YouTube - JangJi