In Skull and Bones, upgrading your fleet is one of the most important ways to improve your performance on the open seas. Among the available vessels, the Frigate stands out as a powerful large ship that requires extensive investment to reach its maximum potential. However, advancing this ship through higher upgrade tiers demands a large amount of Deep Iron, making resource farming a major part of the progression journey.
For players looking to strengthen their ships faster, having enough Skull and Bones Items can make the upgrade process smoother by providing access to important resources and progression materials.
Frigate Upgrade Materials and Requirements
The Frigate upgrade path requires both raw Deep Iron and refined Deep Iron Plates. Early upgrades use the raw material directly, but higher levels require players to process Deep Iron through a Blacksmith.
Deep Iron Plates are crafted at a rate of 1 plate for every 5 Deep Iron, meaning players will need to gather a large amount of the raw resource before reaching the final upgrade stages.
| Upgrade Level | Required Materials |
| Level II | 30 Deep Iron |
| Level III | 35 Deep Iron |
| Level IV | 35 Deep Iron |
| Level V | 40 Deep Iron |
| Level VI | 5 Deep Iron Plates |
| Level VII | 7 Deep Iron Plates |
The transition from raw Deep Iron to Deep Iron Plates begins at Level V, creating a significant resource requirement for players aiming to fully upgrade their Frigate.
Best Ways to Farm Deep Iron
Deep Iron is one of the biggest bottlenecks during Frigate progression. While the material can take time to collect, several activities provide reliable farming opportunities.
Plunder Megaforts
Megafort plundering is one of the most consistent methods for obtaining Deep Iron. Successful runs usually reward around 4 to 6 pieces of Deep Iron, allowing players to steadily build up their stockpile while completing challenging naval encounters.
Because Megaforts also provide valuable loot, they are a worthwhile activity for players who want both resources and additional rewards.
Purchase From Blackwood
Players can also obtain Deep Iron directly from Blackwood by spending Guildmarks. However, his inventory operates on a weekly restock timer, so this method is limited and requires planning.
Checking Blackwood regularly ensures you do not miss opportunities to secure extra materials for your Frigate upgrades.
Use the Pirate Ledger During Faction Wars
The Pirate Ledger provides another dependable source of Deep Iron during Faction Wars. Participating in these activities not only contributes to faction progression but also helps gather materials needed for large ship improvements.
Players who want to reduce farming time can also consider options such as buying Skull and Bones Silver to improve their overall progression efficiency and focus more on exploration, combat, and ship customization.
Important Tips Before Upgrading Your Frigate
Before attempting a Frigate upgrade, make sure your ship is not assigned to any manufactories. Skull and Bones does not allow ships to be upgraded while they are currently attached to a manufactory.
To avoid unnecessary delays:
- Remove your Frigate from any manufactory assignment before upgrading.
- Gather enough Deep Iron in advance instead of collecting materials upgrade by upgrade.
- Convert Deep Iron into Deep Iron Plates only when needed for higher-level upgrades.
- Plan your farming routes around Megaforts, Blackwood’s inventory, and Faction Wars.
Following these steps will help you avoid interruptions and make the Frigate upgrade process much more efficient.
Why Frigate Upgrades Matter
A fully upgraded Frigate gives players a stronger foundation for high-level naval battles, exploration, and future content. While the resource requirements may seem demanding, investing time into gathering Deep Iron allows captains to unlock the full strength of one of the game’s most powerful ship classes.
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Build Your Ultimate Pirate Fleet
The journey to a maximum-level Frigate requires patience, preparation, and efficient resource management. Deep Iron remains the key material that determines how quickly players can progress, so knowing where to farm and how to plan upgrades is essential.
Whether you are preparing for tougher battles or building a stronger pirate empire, mastering the Frigate upgrade system will give you a major advantage across the seas.