1.) Upon entering the dungeon, you need to defeat the Lava Hound monsters until the Lava gate opens.
2.) When the gate opens, Lava Elemental monsters will appear. You need to defeat them to open the next gate. There are (4) four Lava Elementals.
3.) Move forward taking the trail after the second gate was open.
4.) You will be blocked by a Lava Archer monster and behind it is a Lave Gate. Defeat the monster to proceed.
5.) At the end of the road, (2) Lava Spirits will appear. Defeat them to summon a boss monster.
6.) Flame Guard Einzerki will appear at the middle path. Defeating this boss monster is a bit tricky.
7.) When you are near the boss monster, move your camera a bit to the right to copy the image below. A Lava Spirit will appear on the upper portion of the dungeon. Once a Lava Spirit appears boss monster “Flame Guard Einzerki” will be indestructible. You need to defeat the Lava Spirit first to make the boss monster vulnerable. So, you need to go up to the Lava Spirit defeat it then go back to the boss monster to hit it or to decrease its HP with your skills.
8.) After defeating the boss monster, destroy the Treasure Chest for a reward then (3) three Lava Spirits will appear.
9.) Defeat the (3) three Lava Spirits to open the gate.
10.) Once the gate is open, just dash your way to the end until you reach the Lava Gate.
11.) Destroy the Lava Gate to proceed.
12.) When you enter the room, you will notice a Relic Chest and the Sleeping Eurostia (Lava Dragon). Destroy the chest and it will awaken the Dragon.
13.) Defeat Flamebound Eurostia for a Legendary Box and to finish the dungeon. Watch out because the monster can stun for about 1 – 2 seconds.