Octopath Traveler 2 Inventor Skill Locations and Unlock Guide

Tinkering through Octopath Traveler 2’s lands can yield more than treasure-hidden inventor items lie tucked away in overlooked corners, each one powering up unique mechanical skills that can turn the tide of any battle.

You start with two skills, Changeable Catapult and Springy Boots, but the other skills require you to present Akar with items. Some items are easy to find – and you’ll likely have them on hand – like soulstones and weapons. However, other items are unique and require you to find hunt them down, by stealing them from NPCs or finding them in chests.

Once you make each of the inventions, you’ll get the Divine Skill“All-Purpose Tool,” which begins the crafting time on all inventions, so you don’t have to wait for another turn. You’ll also get some money and the Mechanical Top Hat armor.

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You will need characters who can steal items from and knock out NPCs in order to get some of these. We recommend using Agnea and Throné.

Below, we list out where to find the equipment and unique items you’ll need to learn all the inventor skills.

Critical Scope item locations

Critical Scope items can be found in specific locations tied to each inventor’s blueprint. The Critical Scope itself is obtained in the town of Conning Creek by examining a chest near the western pier. Players can access it after reaching the chapter segments that lead to this coastal area. Collecting it allows the inventor to craft a device that increases precision in battles, making it a useful addition to the Inventor’s skill set.

Both the items needed for Critical Scope (Unerring Earring and Critical Earring) can be purchased from weapon shops.

Unerring Earring is from New Delsta (where you get Throné) and Critical Earring can be bought from Canalbrine (where you get Castti).

Elemental Bomb Bottle item locations

The Elemental Bomb Bottle can be obtained in two places. One is in the Chest in an abandoned village in the Western Tropu’hopu Traverse, hidden near the coast. Another copy can be purchased from a merchant in Tropu’hopu using Partitio’s Purchase ability. Collecting this item allows you to complete one of the key Inventor recipes required to expand your skill options.

To build the Elemental Bomb Bottle, you’ll need a Fire Soulstone, Ice Soulstone, Thunder Soulstone, and a Rainbow Glass Bottle. The soulstones are easy enough to come by – you should get a ton from pickpocketing NPCs, defeating monsters, and opening chests.

However, the Rainbow Glass Bottle is a unique item in a specific chest in the harbor area of Conning Creek, as marked below:

Tin Horn item locations

The Tin Horn can be obtained on the nameless island located far to the northwest on the world map. It rests inside a chest on the central plateau, which can be reached after finishing Partitio’s storyline. The island becomes accessible only once you recruit the Inventor and gain access to a boat, making it one of the final inventor items most players collect.

The Tin Horn requires an Empowering Lychee (which you can find in loads around the world), a Tin Toy and a Mythical Horn.

The Tin Toy is a unique item that requires you to complete chapter three of Partitio’s storyline. Once you finish the department store in Wellgrove, go inside at night. A merchant inside will have the toy, which you can take off of him:

The Mythical Horn is in a chest in Nameless Village. You will have to knock out a beastling to get to it:

Hastening Hammer item locations

The Hastening Hammer can be obtained in the Roque Island area, inside a chest located near the harbor. You’ll need to progress through the local story events to access the gated zones leading there. After reaching the deeper section of the island, check the southern dock area past the shipyard to find the chest. This item is required for developing one of the Inventor’s time-based support skills, so collecting it early can greatly improve your crafting options.

The required items for the Hastening Hammer are a Soldier’s Bow, a Great Blade, and a Guardian’s Axe. The Soldier’s Bow can be bought from the shop in Clockbank and the Guardian’s Axe can be bought from the weapon shop in Stormhail.

The Great Blade isn’t a unique item, but you can grab one from this soldier in the tavern at night in Stormhail. Agnea can get it off of him if she’s level 37 or higher.

Arkar’s Coil item locations

Arkar’s Coil item locations include the Garment District’s inventor shop, the Market districts’ chests near the item benches, and a hidden crate behind a stack of crates in the warehouse district; collect all coil components to assemble Arkar’s Coil for boss fights and crafting upgrades.

Arkar’s Coil is the last skill and it requires the most items, all of which are unique: Scrap Metal, an Ancient Cog, and Natural Magnetite.

An NPC in Clockbank’s Industrial District has the Scrap Metal and you can use any of the party’s respective item-taking skills to get it from them:

The Ancient Cog is on Roque Island, and you’ll need to get it from an NPC at night. If you don’t have access to Roque Island, you need to do more of Partitito’s story to unlock the boat. The NPC is in the location below, in the house next to the tavern:

The Natural Magnetite is inside a mine labeled as an “Unfinished Tunnel” connected to Southern Crackridge Wilds. You’ll need to knock out the NPC in front that warns you that it’s too dangerous and open up a chest:

What are the best Inventor skills and their effects

Inventor skills in Octopath Traveler 2 stand out for their utility in tough battles, offering buffs, AoE damage, and recovery without SP costs once unlocked. Top picks include Arkar’s Coil for its revival power, Springy Boots for speed control, and Hastening Hammer for burst damage acceleration.​

Top Inventor Skills

These are widely regarded as the best due to versatility across party builds and late-game bosses.​

• Arkar’s Coil: Restores 40-100% HP/SP to one ally (scales with proficiency) and grants 1-4 BP; revives downed allies. Essential for sustainability in prolonged fights.

• Springy Boots: Makes one ally act first for 5-8 turns. Enables early nukes or setups, synergizing with characters like Partitio.

• Hastening Hammer: High physical damage to a foe plus reduces invention crafting time by 1 turn. Speeds up skill deployment in Inventor-focused parties.

• Tin Horn: Fills all allies’ Latent Power gauges. Accelerates divine skills and boosts overall party output.

• Changeable Catapult: AoE attack with any equipped weapon type. Flexible damage option unlocked from the start.

Strategic Use

Pair Inventor on Partitio for instant max-power inventions via his Latent Power, or Agnea to apply buffs/debuffs party-wide with Dancer. All skills are free post-unlock and shine in secret boss encounters needing precise timing.​

How to unlock all Inventor skills and inventions

Inventor skills in Octopath Traveler 2 are unlocked by gathering specific items and delivering them to Arkar at his house east of New Delsta on the New Delsta Highroad. You start with two free skills, then craft five more inventions via his display cases, unlocking everything for all party members at once-no JP needed.

Unlocking Process

Visit Arkar after reaching mid-game areas; he’ll grant the Inventor license and Proof of the Inventor item. Examine his five empty display cases, note the required items for each invention, collect them via chests, steals, purchases, or drops, and return to him. Completing all five automatically unlocks the divine skill and rewards 10,000 leaves plus Mechanical Top Hat (accuracy helm).

Required Items by Invention

Tips for Efficiency

Use Throné or Agnea for steals/incapacitates on NPCs; Partitio for purchases. Some require night time, story progress, or path actions-check video guides for visuals if stuck. All-Purpose Tool (divine skill) then lets you instantly craft any invention in one turn.​