The Volcanic Caves (Japanese: ) is the second location that ARKS operatives visit in Phantasy Star Online 2. It is located on Planet Amduskia. The terrain in this harsh volcanic cavern is rife with hazards; fire shoots out from underneath the magma that can and will deal damage, causing players to be flung across a small area. The magma itself can deal damage, as well.
Draconians[]
These monsters are overall weak to 
.
Rare Forms[]
Falspawn[]
In their attempts to spread their influence across the universe, certain Falspawn have taken to invading this forest land. The common mobs that are often encountered in this habitat are known as "insect falspawn", creatures that have a bug-like quality to their anatomy and are commanded by Dark Falz Apprentice.
These monsters are generally weak to 
and/or 
.
Roaming[]
Upon being encountered for the first time, these Falspawn have a chance of appearing anywhere. They are all weak to .
Quests[]
The following quests take place in the volcanic caves area.
Expeditions[]
ARKS Quests[]
Time Attack[]
- Running Maneuvers: Amduskia
Story Quests[]
Main Story[]
- Seeker of Truth (Event)
- A Vacant Presence (Event)
- A Sweeter Way of Fighting (Event)
- Launching an Investigation of the Draconians (Event)
- A Multitude of Falspawn (Event)
- Draconian Remains (Event)
- The Dragons' Malady (Quest)
Substory[]
- Guns are Glorious (Event)
- Watch Out for Falspawn! (Event)
- Something Even Worse Than Humans (Event)
Advance Quests[]
- Advance Directive: Volcanic Caves
               
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| Playable Races | Human - Newman - CAST - Deuman |
|---|---|
| Playable Classes | Hunter - Fighter - Ranger - Gunner - Force - Techter - Braver - Bouncer - Summoner - Hero - Phantom - Étoile - Luster |
| Weapons | Sword - Wired Lance - Partisan - Twin Daggers - Double Saber - Knuckles - Katana - Soaring Blades - Gunblade Assault Rifle - Launcher - Twin Machine Guns - Bow Rod - Talis - Wand - Jet Boots - Harmonizer |
| Armors | Rear - Arm - Leg - Sub - Ring |
| Others | Auxiliary - Mag - Pet - Weapon Camo - Weapon Form |
| Guardian | Protagonist - Matoi |
| Council of Six | Regius - Maria - Casra I - Casra II - Atossa - Zeno - Klariskrays - Klariskrays II - Iris - Wolf - Huey - Quna |
| ARKS/Oracle | Afin - Aika - Aki - Azanami - Cofy - Echo - Euclyta - Filia - Fourie - Gettemhult - Io - Katori - Kyokuya Ludmila - Lukot - Marlu - Melfonseana - Melrandia - Oza - Pati - Pietro - Risa - Rojio - Saga - Sarah - Stratos Theodor - Tia - Ulku - Wright - Xiao - Xiera - Xion - Zig |
| Allies from Other Planets | Ro'Kamiz - Ko'Rela - Ko'Riu - Cabracan - Sukunahime - Kotoshiro |
| Earth Guide | Ardem Sacrid - Enga Yasaka |
| Earth's Other Inhabitants | Al - Hitsugi Yasaka - Itsuki Tachibana - Kohri Washinomiya - Phaleg Ives - Rina Izumi |
| Denizens of Omega | Alis Landale - Clarissa Maintainer - Florent Arlequin d'Ys Artia - Gettemhult Gwinner - Hariette Renata Reina Cuento Luther Lars Rey Cuento - Lutz Cero Rey Cuento - Margareta - Melfonseana Riesfeldt - Schreger Weyland - Varuna Lashiec |
| The Profound Darkness | Dark Falz (Apprentice - Elder - Gemini - Luther - Persona) - Elmir Weyland - Falspawn |
| Mother Corps | Aratron Tolstoy - Bethor Zelazny - Hagito "Hagith" Anie - Mother - Och Millar - Ophiel Herbert - Phul Janice Lasswitz |
| Photoners | Mitra - Shiva - Varuna |
| Planets | Naverius - Amduskia - Lillipa - Wopal - Harukotan - Earth - Omega |
| Locals | ARKS Ship (Casino) - City Area - Falspawn Den - Oracle Mothership - Forest - Tundra - Ruins - Volcanic Caves Floating Continent - Dragon Altar - Desert - Underground Shafts - Abandoned Mine - Coast - Seabed - Floating Facility Daybreak Province - Nightfall Province - Gemini's Inner Universe - Tokyo - Las Vegas - Bewitched Woods |
| Terms | Client Order - Partner Card (Friendship Level) - Story Progression (Divergence Matrix - Story Board - Story Quest) Cosmogenic Arm - Avatar Arm |