Octora 0 The most powerful legendary weapon A complete strategy guide to obtain the 8 types of sacred treasures at once | How to defeat low-level illusions of great martial artists with a map of all locations of the Seal Crest Key

In Octopath Traveler 0, commonly known as Octora 0, there is legendary equipment that dramatically strengthens battles from the mid-game onwards. These are a group of 8 types of ultra-high performance weapons called the “8 Sacred Treasures''. By clearing this quest “8 Sacred Treasures”, you can obtain the strongest class equipment for each weapon type: sword, spear, dagger, axe, bow, fan, staff, and book. These weapons not only have high attack power, but also have special effects such as increased number of attacks, automatic SP recovery, reduced SP consumption, increased power of all attributes, and inflicted status ailments, which instantly improve the firepower, fuel consumption, and durability of the entire party.

This guide provides a comprehensive explanation of the quest occurrence conditions, detailed routes to obtain the 8 Seal Keys, how to access the Heroic Spirit Island, all behavior patterns and low-level strategy templates for the Boss Master's Illusion, detailed performance of acquired weapons, and optimal usage examples. This is the most difficult test with a recommended level of 60, but if you prepare properly and follow the route, even parties in their level 40s can reliably clear it. You can aim for it as soon as you get the ship, so try it early to make the dungeons and arenas easier in the middle stages. By actually having these weapons, you can more than double the speed of story progression and smooth the transition to end-game content.

1. Conditions and overall flow of 8 types of sacred treasure quests

Octora 0's “8 Sacred Treasures'' is a subquest that occurs at the Tower of Heroic Spirit Island located in the north central part of the open sea. First, you need to obtain the Queen Orsa in the story and be able to sail across the Middle-earth Sea and the Open Sea. This will give you access to the Isle of Heroic Spirits. When you arrive on the island, the quest will automatically occur by examining the tower door, but it is important to meet the following conditions in order to proceed.

• Add Viator to your party (talk to the bard while holding the seal key at Valore's bar)
• Collect all 8 types of seal keys (required to unlock each weapon pedestal)
• Recommended level: 60 (low level strategy will be explained later)

The quest flow is simple. Examine the glowing green sphere inside the tower and move to the “Room of Sealed Weapons”. As you approach each weapon pedestal, an event will occur, and you will enter into a battle with the formidable boss “Illusion of the Great Master''. After winning, you can obtain weapons one by one by using the corresponding seal keys on the pedestal, and the quest will be cleared by collecting all 8 types. The time required is about 2 to 3 hours, including collecting the keys, but since the keys are scattered over a wide area, steady searching is the key.

The biggest appeal of this quest is the efficiency of obtaining it all at once. Normally, it would be a hassle to search for the strongest equipment for each weapon type individually, but if you gather them here, you can instantly optimize your party. It has many effects that shine especially in long battles where SP management is difficult, and it is a candidate for final equipment along with veteran series and forbidden weapons. If you are a beginner, please advance to the story “The Master of Everything” and challenge yourself while raising your level.

2. Complete collection route and detailed map explanation for all 8 Seal Keys

Seal keys are items that correspond to each weapon type, and are scattered as dropped items in dungeons, treasure chests, begged for/purchased from NPCs, and found on the open sea. You can select up to three when creating your character, but the rest will be collected at various locations. The efficient collection order (land priority → sea area) and detailed locations are explained below with map images. The recommended order is according to the story progression, and you can collect 7 types before getting the ship and 1 type after the ship. The total time required is approximately 1 hour.

Collection priority order and location list

1. dagger key: Serpent's Den (Flatland Region, North Cyatopolis Plain, Recommended Lv.6). It appears as a blue glowing fallen object on the ground on the left side of the cave map. It will be treated as already obtained by character makeup selection. The enemy is a snake type (weakness: spear/fire).
2. sword key: Valore (Woodland region, recommended Lv.4). Obtained automatically by clearing the Viator joining quest “Meeting with Victor.” A conversation with the Bar Bard is required.
3. ax key: Victor Hollow (Woodland region, recommended Lv.34). We will “purchase” (several thousand leaves) from the “fledgling antique dealer” in the center. Please don't forget to check stock.
4. book key: Hot Spring Cave (Highland region, via Belcane Mountain Path, recommended Lv.45). It's a treasure chest on the right side of the cave map. There is a high temperature gimmick, and wind attribute characters are required.
5. fan key: Sufratarja (Sunland region, recommended Lv.39). “Beg'' the “explorer who pursues mysteries'' near the inn. Obtained after the conversation event.
6. wand key: Granport (Coastland region, street stalls, recommended Lv.39). “Beg” to the “black market merchant in the port city”.
7. bow key: East Shiflo Riverbank (Riverland region, recommended Lv.36). It's a treasure chest at the bottom left of the riverbank map. Part 3 “The One Who Bestows Power” will be released after Chapter 1.
8. spear key: Small island in the open sea – East (Coastland region, recommended Lv.50). This is something that fell on the ground in the center of the island. A ship is required, and the enemy is the ice element (weaknesses: spear, fire, lightning, wind).

These locations are placed in a natural route through which the story progresses, making them hard to miss. Please make it a habit to check the number of keys you have when you obtain them, and complete your Viator membership as soon as possible. Once you have all the keys, head straight to the Isle of Heroic Spirits. Please note that the Key to the Spear of the Open Sea will spawn an enemy with a danger level of 50, so use the ship's automatic battles to collect materials as well.

3. Preparation before the boss battle: Party composition, equipment, and mastery template

The Illusion of the Great Master is a special specification with no weak point display, and is characterized by high-frequency, physical-centered all-over attacks. In order to conquer low level (Lv 40s), we will prepare with a focus on parrying and physical defense. The recommended party is the durable type, which is essential for Viator.

Required preparation items

• Extreme consciousness: Viator “Parry” 3 (Ensures 8 or more evasions). Inherits “rear support” from the main character “Hunter”.
• equipment: Experienced series (high physical defense), recovery limit breakthrough accessory (total recovery increases HP limit). Increases maximum SP with cooking.
• Party example (low level template):

vanguard	role
Viator	parry tank
Olberic	Damage limit exceeded
Hydne	Debuff/Steal
Skia	Physical defense buff

rear guard	role
merchant	lucky arrow power
scholar	buff
priest	total recovery
alexia	Special accumulation

At the beginning, increase and decrease physical defense and maintain boost with BP circulation. Maximize your SP by eating food. This formation can withstand even Lv40.

4. Complete guide to the illusion of the great master: All action patterns and turns

Boss HP 195,470, shield 20. Weaknesses: Sword, axe, fan, fire, lightning (shifts from spear to bow when changing hands). Bleeding passes, but it is inefficient. Physical counterattacks and attribute counterattacks are often used.

whole behavior pattern

• usually: All-weapon attack (sword: multi-stage slash) or single high firepower.
• Switching weapons: Weakness changes. Prepare for multiple breaks.
• counterattack: Activates immediately upon break. Parrying is required.
• The ultimate military: 8 hits on a single target at maximum BP, super firepower. Prevent it by consuming BP in advance.

Strategy by turn

1. Opening (1-2 turns): Boost max parry for everyone. Stacks 3 levels of physical defense up and 3 levels of physical defense down.
2. break phase: A simultaneous attack of sword, axe, fan, fire, and lightning will reduce the shield at once. When the yellow gauge enters, I will do a special fold.
3. midfield: Parry and keep 8 remaining. Provide cover fire with rear cover. SP recovery weapons can be used for long periods of time.
4. final stage: Uses a chance to lower defense and performs secret techniques repeatedly. Prioritizes maximum BP blocking.

At low levels, the number of parries will be increased to 10 or more, and full recovery will be performed once per turn. If you win, you will proceed to collect the weapon immediately.

5. Steps to obtain legendary weapons and instant effect verification

After defeating the boss, approach each pedestal between weapons and use the corresponding key to obtain it. The order is free, but priority will be given to the firepower type. Immediately after getting it, you can feel that your party's firepower will be 1.5 times more powerful and your SP efficiency will be 2 times more effective. You can complete the quest with all 8 types and get a jewelry bag etc. as an additional reward.

6. Detailed performance of legendary weapons specializing in firepower and optimal character usage

The four firepower types specialize in improving pure damage. Perfect for physical attackers.

• lightning sword(Sword): Physical attack +380, physical defense +120, number of attacks +1. DPS is the best with stable consecutive attacks. Required equipment for sword attackers.
• Spear of wind and clouds(Spear): Physical attack +375, speed +99, in rare cases, own physical power +. It's a high-speed spear attack. Suitable for speed type spear users.
• Assault dagger(Dagger): Physical attack +360, critical hit +132, rare paralysis. Critical explosion + interference. Suitable for dagger critical build.
• moonlight bow(Bow): Physical attack +363, attribute attack +370, speed reduction in rare cases. Bow attribute hybrid + action control. I am the archer rear guard firepower king.
• sacred tree ax(Axe): Physical attack +300, attribute attack +350, all attribute attack power +. Compatible with physical magic. Transforms into a mixed attribute ax attacker.

Assign these to the vanguard to strengthen pursuit after a break. Dungeon destruction speed will be greatly increased.

7. Detailed performance and long-term battle operation of support/endurance legendary weapons

The three support types stabilize the party by strengthening SP and defense.

• book of the sun(Book): Physical attack +186, attribute attack +400, SP consumption reduced by 25%. Magic Attacker fuel efficiency revolution. Scholars and book users will use it forever.
• wand of order(Cane): Physical attack +198, attribute attack +380, recovers 6 SP every turn. Support role infinite SP. A standard for priests and cane healers.
• twilight fan(Fan): Physical attack +352, elemental attack +373, rare elemental defense reduction. Defense specialization + debuff. The fan tank is unrivaled in durability.

Rear guard support prevents SP depletion and doubles boss battle durability. The undefeated party in the arena is completed.

8. Comprehensive evaluation of 8 types of sacred treasures and summary of level 99 final training compatibility

The 8 types of sacred treasures have performance comparable to veteran and forbidden items, and can be included in the final equipment with a high degree of freedom. The firepower group provides short-term decisive battles, while the support group provides long-term stability. In level 99 training, each person will be assigned one, and through mastery and combination, they will be able to break through the damage cap. It is useful immediately after obtaining it, and is the main force until the final stage “Seal of the Ring”. Priority collection is always recommended. Conquer all Octra 0 content with this equipment.