Final Fantasy Resonance Boss Guides
Find seven boss strategies from Siren to Chaotic Darkness, including Gilgamesh and Ultima Weapon, plus all 15 Cave Master locations.
Cave Masters
Find all 15 Cave Masters by region and suggested level. Learn how to enter their caves, start the fight and track the one, five and all-master objectives.
Open guideSiren boss guide
Prepare Lightning attacks and Charm protection for Siren, find the tower route and turn Stagger openings into a safe chapter-1 victory.
Open guideSephiroth boss guide
Reach Whirlpool Hollow, handle Masamune in Waiting and changing infusions, and prepare the final damage window to unlock the Sephiroth Vision.
Open guideUltima Weapon guide
Unlock the post-story Ardra Crater encounter, compare Ultima Weapon’s four modes and reserve a response to Ultima Beam before committing to attacks.
Open guideAlluvion boss guide
Use Lightning against Alluvion, destroy Prism Cores before absorption and keep healing available during the chapter-3 Water Shrine fight.
Open guideBehemoth boss guide
Prepare Wind and Light for Behemoth’s high defenses, protect your healer from Paralysis and plan a Stagger response to Meteor.
Open guideChaotic Darkness boss guide
Defeat the Left Hand before the Right Hand, prepare the reserve party and use Last Resonance without losing your only available healer.
Open guide
Gilgamesh & Genji gear
Follow Gilgamesh from the optional tower meeting to the airship and bridge encounters, recover the Genji Gloves and finish for Genji Armor.
Open guideAn encounter index for the published guides below. This hub does not claim a complete bestiary or verified strategy for every story boss.
On this page
Choose the encounter you are facingDiagnose a failed attempt before rebuildingBuild the required options before levelling blindlySources & reviewChoose the encounter you are facing
| Encounter | What the guide resolves |
|---|---|
| Siren | Lightning access, Charm protection and the chapter-1 battle. |
| Alluvion | Lightning, Prism Cores and the Water Shrine encounter. |
| Behemoth | Wind/Light access, Meteor timing and healer availability. |
| Gilgamesh | The optional chase, airship fight and Genji Armor finale. |
| Chaotic Darkness | Hand order, the second form and reserve rotation. |
| Sephiroth | Whirlpool Hollow access, counter stance, infusions and the timed finish. |
| Ultima Weapon | Post-story unlock, changing modes and the major-attack response. |
| All 15 Cave Masters | Region, named cave and reported entrance-level order. |
Match the actual encounter. A story appearance, an optional recruitment fight and a later rematch can have different conditions even when they use a familiar enemy name.
Diagnose a failed attempt before rebuilding
- You lose control of the party: identify the ailment and equip its prevention before retrying. Siren’s Charm is an early example.
- Physical attacks produce counters: inspect the boss’s stance instead of repeating the same action. Sephiroth explicitly tests this.
- A previously useful spell stops working: inspect the current mode or infusion and check its resistance again.
- You reach a major attack without recovery ready: reserve the relevant defensive or healing action before the attack reaches the timeline.
These are diagnostic checks, not a universal elemental chart. Read the individual fight guide for the confirmed trigger and response. The combat guide explains Stagger and Resonance without importing rules from another Final Fantasy title.
Build the required options before levelling blindly
Use the Vision directory to locate the commands or role you are missing. Use Legendary Arms for equipment acquisition; a component in its Ancient state has not yet been restored. Check the actual commands and equipped passives immediately before entering the fight.
Official game screenshots © SQUARE ENIX
Sources & review
Sources checked on 26 October 2026. This is a source-based guide, not a claim of independent gameplay testing. A specific patch number has not been verified. Read our editorial policy.
- Square Enix — game informationPublisher
- PowerPyx — Cave Master locationsIndependent guide
- KeenGamer — Sephiroth encounterIndependent guide
- FF Resonance Wiki — Siren encounterIndependent guide
- FF Resonance Codex — Ultima Weapon variantsCommunity game-data reference
Continue your journey
Combat & Stagger
Read the action timeline, compare HP and Stagger damage, understand Sweeping Stagger and choose the right moment for your Vision's Resonance.
Open guide
All Visions
Find all 26 Visions by chapter, region, role and unlock method. Includes sanctum directions, quest names and the Sephiroth battle requirement.
Open guideLegendary Arms
Locate all 12 Ancient components, unlock the Chamber of Arms and restore the Legendary Arms. Includes radar upgrades, shard rewards and merchant prices.
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