FF Resonance Chapter 2 Boss Weaknesses: Ramuh and Wave Cannon

Quick answer: Final Fantasy Resonance Chapter 2 has five story bosses and one optional trial: Liquid Thunder (Earth), Mom Bomb (Water, never Fire), Epimetheus (Lightning), Adrastea (Lightning or Water), the Wind Shrine boss Aether (Ice) and Ramuh (Earth). Break each stagger gauge with its weakness to cancel devastating attacks such as Adrastea’s Wave Cannon.

The moment you finish the demo’s Chapter 1 in Final Fantasy Resonance, you walk into Chapter 2, “Eternal Blue”, set on Dirnado, the Continent of Wind. Most English guides stop at Siren. This one covers the Chapter 2 bosses in story order: Liquid Thunder, Mom Bomb, the Epimetheus ambush, Adrastea and the Wind Shrine boss, plus the optional Ramuh trial, with each one’s weakness, HP, stagger gauge and the move that actually kills parties.

Party loadout at a glance: bring Earth for Liquid Thunder and Ramuh (Lid’s own kit), Water for Mom Bomb (never Fire, it halves it), Lightning or Water for Adrastea, and Ice for the Wind Shrine boss. Against Adrastea, break the stagger gauge before the charged Wave Cannon fires at the end of the next turn.

By Ashish Sharma · Updated November 2, 2026 · How we tested: numbers are Normal difficulty values from the game’s enemy data as published by the atma.gg databook and vorxu bestiary, cross-checked against the Chapter 2 story order on the FF Resonance Wiki and the Japanese walkthrough on AppMedia. Where we are inferring something, we say so.

What are the Chapter 2 bosses and their weaknesses?

Short answer: six fights, in story order: Liquid Thunder, Mom Bomb, Epimetheus, Adrastea, Aether and the optional Ramuh. Two of them nullify an element and one halves Fire, so the “Don’t use” column matters as much as the weakness.

Boss	Where	Level	HP	Stagger gauge	Weak to	Don’t use
Liquid Thunder	Mt. Thunderclap	13	10,000	400	Earth	Lightning (nullified)
Mom Bomb	Dwarven Forge	14	21,000	400	Water	Fire (halved)
Epimetheus + 2 Security Eyes	Mobliz Shipyard	16 / 14	3,645 (Epimetheus)	350	Lightning	None listed
Adrastea	Mobliz Shipyard	16	25,000	800	Lightning, Water	None listed
Aether (Wind Shrine boss)	Wind Shrine	18	34,000	750	Ice	Wind (nullified)
Ramuh (optional esper trial)	Misty forest near Mt. Thunderclap	20	24,000	600	Earth	Lightning (immune)

How does stagger win every Chapter 2 boss fight?

Short answer: weakness hits triple stagger damage, and a staggered boss loses its turn, takes extra damage and cannot land its devastating attack.

Resonance runs on the stagger gauge shown under each enemy’s HP. Hitting a weakness triples the stagger that hit deals, and an empty gauge means the enemy is staggered: it loses its turn and takes extra damage. The game’s own tutorial also says a devastating attack can be prevented by staggering the enemy, with Defend as the fallback. If you stagger every enemy on the field in one turn, that is a sweeping stagger, which gives every party member a bonus action and a Resonance attack at the end of it. Solo bosses give you a sweeping stagger every time you break them, which is why clearing adds first matters so much in this chapter. The same rule decides the optional caves, covered in our FF Resonance cave masters guide.

Your new party member Lid joins at the shipyard early in the chapter. Her kit is built around Earth: Mechabo Kick (Earth physical) and Stone (Earth magic) from level 1, then Stonera at level 16. Tronn’s Vision gives you Thunder (Lightning), and its Last Resonance finishes on Ice. Check your Visions and items menu for Water and Ice options before the Forge and the Wind Shrine.

What should you do before starting Chapter 2?

Pay the 1,000 gil at Mt. Thunderclap. When you enter the mountain, an event lets you pay 1,000 gil to open a shortcut to the save point. Japanese launch guides recommend paying it.
Put Lid in the party right away. She’s the only built-in Earth damage you have for Liquid Thunder.
Stock healing. Chapter 2 has paralysis (Liquid Thunder, Ramuh), Blind (Ramuh), Sleep (Aether’s minions), and a 15-minute escape sequence where battles still eat the clock.

How do you beat Liquid Thunder (Mt. Thunderclap)?

Level 13 · 10,000 HP · stagger gauge 400 · weak to Earth · Lightning nullified. It also has a passive that cuts physical damage taken by 30%.

Lead with Earth magic. Because of the 30% physical damage cut, Lid’s Stone should outperform Mechabo Kick here (our inference from the passive; both are Earth, so both triple stagger).
Watch for “Charging electricity!” The data lists a charge-up move followed by Gigavolt, its strongest single-target hit. When you see the charge, push every action into stagger or have the target Defend.
Cure paralysis fast. Japanese launch guides flag its Lightning paralysis as the main threat. Megavolt is the move to fear.
It fights alone, so every break is a sweeping stagger. Spend the bonus round on damage.

Reward: 1,350 EXP, 1,500 gil, Lightning Scroll I.

How do you beat Mom Bomb (Dwarven Forge)?

Level 14 · 21,000 HP · stagger gauge 400 · weak to Water · Fire halved. This is the “Defeat the monster at the forge” objective after you visit Borin.

Bring Water and drop Fire. Mom Bomb casts Fire and Fira and halves Fire damage, so a Fire Vision is wasted here.
Expect it to split. Japanese walkthroughs report that Mom Bomb breaks into four Great Bombs once you lower its HP, and its data includes Call in Group, a self-destruct trait and an Explode attack that hits the whole party.
Kill the Great Bombs quickly. Each has only 1,000 HP and a 120 stagger gauge, is weak to Water and halves Fire, and has a Self-Destruct limit burst. Clearing them fast (party-wide Water if you have it) is our recommended way to avoid stacked explosions.
Body Slam has lower accuracy but can paralyze, so keep a cure ready.

Reward: 1,350 EXP, 3,000 gil, Flame Scroll II.

How do you survive the Mobliz Shipyard escape and Epimetheus?

Short answer: save before the final elevator, skip detours because battles eat the 15-minute timer, and open on Epimetheus with Lightning.

Entering Mobliz Shipyard starts a fight with two Eyes that Japanese guides describe as weak enough to auto-attack. Later you power the elevators, rescue Borin, then get a 15-minute timer to escape the factory. Battles count against the clock, and Japanese guides warn that a wrong lever choice starts a fight you cannot flee, so save before you ride the final elevator and don’t wander.

Heading back to the right-hand elevator triggers Epimetheus with two Security Eyes. All three are weak to Lightning. Epimetheus (3,645 HP) is described in its data as powerful and hard to stagger, and it uses paralysis and poison attacks, so open with Thunder and keep cures handy.

How do you beat Adrastea (Mobliz Shipyard)?

Level 16 · 25,000 HP · stagger gauge 800 · weak to Lightning and Water. This is the Chapter 2 skill check, because its gauge is double the earlier bosses’.

Move	What it does	Answer
Charge Wave Cannon	Readies the cannon, which fires at the end of the next turn	Stagger it before it fires, or Defend
Wave Cannon	Its limit burst and strongest party-wide magic hit in the data	Prevented by a stagger
Missile	Fixed damage equal to one third of the target’s HP	Heal the target before the next big hit
Flash Bomb, Fira, Flame Thrower, Machine Gun, Atomic Ray	Filler damage	Ignore and keep staggering

Give everyone a Lightning or Water action. Japanese guides recommend Lightning on every party member. Tronn’s Thunder is the obvious one.
Read the trait: Adrastea “readies a special skill when its stagger gauge is reduced.” Expect the Wave Cannon charge once you’ve chipped the gauge, and hold enough weakness hits to finish the break before the end of the following turn.
Don’t panic at Missile. It’s percentage damage, so it can’t kill a full-HP character alone. It just sets up the cannon.

Reward: 2,250 EXP, 3,000 gil, Lightning Scroll II. Afterward, return to the Dwarven Forge for the Arise, Mechabo! quest, which repairs Lid’s Mechabo.

How do you beat the Wind Shrine boss (Aether)?

Level 18 · 34,000 HP · stagger gauge 750 · weak to Ice · Wind nullified. Japanese guides call this boss Veritas of the Heavens (天風のヴェリアス) and list it as weak to Ice and resistant to Wind. The level 18 “Aether” entry in the game’s English data matches that profile, so we’re treating them as the same fight. Treat the name as unconfirmed until we see it on screen.

Bring Ice. Wind enemies fill the shrine too, and Japanese guides recommend Ice there as well.
Kill the Guardian first. Aether summons a Guardian (3,000 HP) that heals it with Cura and buffs it with Protect and Shell, plus a Minion (2,750 HP) that casts Sleep, Gravity and Drain. Both are weak to Ice and halve Wind.
Clear the adds, then break Aether alone. With the adds gone, every break becomes a sweeping stagger with a full bonus round.
Heal through Heavenly Wind. Its limit burst is the strongest party-wide move in Chapter 2’s data. Japanese guides suggest healing with Cura after its big hits.

Reward: 2,700 EXP, 4,500 gil, and Sylph’s Tiara, an accessory that adds Wind to non-elemental physical attacks.

How do you beat Ramuh (optional summon trial)?

Level 20 · 24,000 HP · stagger gauge 600 · weak to Earth · immune to Lightning. He waits in the misty forest near Mt. Thunderclap, and beating him lets you summon him.

Use Lid’s Earth skills. Stonera (learned at level 16) is ideal.
His devastating attack, Thunderspark, has a 50% chance to paralyze for 2 turns. Stagger him to stop it.
Flash blinds the whole party for 2 turns, which hurts physical attackers. Lean on magic.
He is immune to Silence and Paralysis, so don’t waste turns on them.

Reward: 2,250 EXP, 1,500 gil, Magicite Shard, and Ramuh as an esper.

FF Resonance Chapter 2 bosses FAQ

What are the Final Fantasy Resonance Chapter 2 boss weaknesses?

Liquid Thunder: Earth (Lightning is nullified). Mom Bomb: Water (Fire is halved). Epimetheus: Lightning. Adrastea: Lightning or Water. Wind Shrine boss (Aether): Ice (Wind is nullified). Ramuh: Earth.

How do you stop Adrastea’s Wave Cannon?

Break its 800-point stagger gauge before the end of the turn after it charges. A stagger prevents the Wave Cannon; if you can’t break it in time, Defend.

What is the hardest boss in Final Fantasy Resonance Chapter 2?

Adrastea. Its 800-point stagger gauge is twice the size of Liquid Thunder’s and Mom Bomb’s, and its Wave Cannon fires one turn after the charge. If nobody brings Lightning or Water, the break comes too late.

What is Mom Bomb weak to?

Water. It halves Fire, and the four Great Bombs it splits into are also weak to Water and halve Fire.

Is Ramuh required in Chapter 2?

No, the Ramuh fight is an optional summon trial, but winning makes him an esper you can call into battle.

How do you beat Ramuh?

Ramuh is an optional Level 20 trial near Mt. Thunderclap (24,000 HP, stagger gauge 600). He is weak to Earth and immune to Lightning, Silence and Paralysis. Use Lid’s Earth skills — Stonera, learned at level 16, is ideal — and stagger him to stop Thunderspark, which has a 50% chance to paralyze for 2 turns. His Flash blinds the whole party for 2 turns, so lean on magic. Winning lets you summon him as an esper.

Do battles stop the Mobliz Shipyard escape timer?

No. Japanese launch guides note that time keeps running during battles in the 15-minute escape, so save first and avoid detours.

Do these numbers apply on Expert difficulty?

No. Every HP and stagger value above is for Normal difficulty. Easy and Expert scale differently, so expect different numbers on Expert.

Is it possible to beat the Chapter 2 bosses on Expert difficulty?

Yes, the plan is the same: hit each weakness to break the stagger gauge before a devastating attack lands. Expert raises HP and stagger values, which we have not verified, so bring weakness actions for every party member and keep Defend ready for Adrastea’s Wave Cannon.

Which element should Lid use in Chapter 2?

Earth. Her Mechabo Kick and Stone are Earth from level 1 and Stonera arrives at level 16, which covers Liquid Thunder and Ramuh, the two Lightning bosses that nullify or ignore Lightning.