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Core of Oath is the syntony material to increase the syntony level of Bloodpact's Pledge (Rover's Weapon). Check out how to get Core of Oath, how to use it, and other information in this guide!
List of Contents
As of writing, you can obtain four Core of Oath to push Bloodpact's Pledge to the maximum of Syntony Level 5. All four are obtained from the map completion of Septimont, Fabricatorium of the Deep, and Sanguis Plateaus.

Players can get two copies of Core of Oath from the 25% and 75% map completion milestone of the Septimont map. This pushes Bloodpact's Pledge to Rank 3!

In Version 2.5, players can get another Core of Oath when you reach 75% map completion for Fabricatorium of the Deep. This pushes the Bloodpact's Pledge to Rank 4.
Fabricatorium of the Deep Map Guide

In Version 2.6, players can finally maximize the Bloodpact's Pledge to Rank 5 by getting the final Core of Oath by completing 75% map exploration in Sanguis Plateaus!

You can use a Core of Oath to Syntonize the 5-star Weapon Bloodpact's Pledge. This makes the weapon's skill stats stronger, and can be done up to 5 times.
Bloodpact's Pledge Weapon Guide
Core of Oath
|
Rarity | 5 |
|---|---|---|
| Type | Valuables | |
| Effect | A Strange Tacetite Bloom arranged in a spiral pattern. Can be used to increase the Syntonization Rank of Bloodpact's Pledge. | |
| This uniquely shaped Tacetite Bloom encages an ancient yet powerful core from which you sense a familiar power. | ||

| Types of Items and Materials | ||
|---|---|---|
| Supplies | Development Materials | Valuables |
| Resources | Mission Items | |
Core of Oath - How to Get and Use



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New way to get core of oath is 75% Fabricatorium of the Deep as well