Vulcanus / Hell
The Lava dungeon behind the Hell Gate in Katan — level 200 to enter, no quest line and no key, plus every drop and combination.
How to Enter
Level 200. That is the whole requirement — no quest line, no key, no difficulty to pick.
The way in is Entrée vers le Donjon des Enfers, a warp gate standing at 115122, 59643 in Katan. Step onto it at level 200 or above and it takes you straight down; below that it turns you away.
The materials for Lava Gear drop inside.
Drops
Monster drop table
Trash mobs and bosses drop the dungeon currency and loot box:
Goutte de lave 
Boîte de lave
From the Lava Box
Opening a Boîte de lave yields the elemental shards (plus a Typhon Shard):
Éclat physique de lave 
Éclat de lave magique 
Éclat de défense de lave Typhon Shard
Combinations
The drops above combine into the crafting reagents used for Lava gear (see the Lava Gear guide for the exact recipes):
Cube de lave 
Cube de lave avancé 
Plume de lave Typhon Crystal Typhon Scroll