The Flask of Cerulean Tears (blue) is one of Elden Ring Items the most important and strategic items in Elden Ring, especially for players who rely on magic, weapon skills, or special abilities. It restores FP (Focus Points), which are required for casting spells (Sorceries and Incantations), using weapon arts, and activating special abilities attached to your weapons or shields.

Key Details of the Flask of Cerulean Tears:
1. Primary Function:
The Flask of Cerulean Tears restores your FP. Whether you’re a magic user who relies on Sorceries and Incantations or a melee fighter who uses weapon arts or special skills, this flask is essential to maintaining your offensive capabilities in combat.

Spells: If you're playing as a Sorcerer or Prophet (magic-focused builds), you'll need FP to cast your spells. The Flask of Cerulean Tears ensures you can continue to unleash powerful spells like Glintstone Pebble or Flame of Frenzy during battle.

Weapon Arts and Special Abilities: For those using weapons with unique abilities (such as Ashes of War), FP is consumed when using these special moves. The flask allows you to refresh your FP and keep using these skills, which can turn the tide of battle.

2. How to Use:
The Flask of Cerulean Tears can be used at any time during exploration or combat as long as you have available FP.

It is an instant-use item, meaning it restores your FP immediately upon consumption, allowing you to continue your magical barrage or weapon arts without interruption.

3. Upgrades:
Sacred Tears are used to upgrade the effectiveness of both your Cerulean and Crimson flasks. Upgrading the Cerulean Flask with Sacred Tears will increase the amount of FP it restores with each use.

Golden Seeds are necessary to increase the number of uses of your flasks. Each Golden Seed allows you to add one more flask charge, up to a maximum of 15 uses for both Cerulean and Crimson flasks combined.

4. Strategic Use:
Managing FP and healing is a constant balancing act in Elden Ring. Using the Cerulean Flask efficiently is crucial, especially during difficult battles and extended exploration. Here’s how to make the most of it:

For Magic Users: If you’re focusing heavily on magic (as a Sorcerer or Priest), the Flask of Cerulean Tears will be your lifeline. Keep it stocked up and use it frequently to ensure you never run out of FP when facing tough enemies or bosses.

For Melee Fighters: Even if you’re primarily a melee fighter, you'll likely want to use weapon skills or Ashes of War frequently. The Flask of Cerulean Tears becomes invaluable for sustaining your ability to perform special attacks.

In Boss Fights: Bosses in Elden Ring can be incredibly difficult, and managing your FP during a fight can be as important as managing your health. A well-timed use of the Cerulean Flask can allow you to deliver crucial magical damage or unleash a game-changing weapon skill when you most need it.

5. Strategic Flask Allocation:
When you reach a Site of Grace, you’ll have the option to customize your flask allocation, deciding how many of each flask you want to carry. The more you collect Golden Seeds, the more you can increase your flask charges, but you’ll still need to strike a balance.

For Pure Magic Builds: If you're focusing on casting spells and managing FP, you’ll likely want to prioritize the Cerulean Flask with a higher allocation of charges to ensure you can keep casting.

For Hybrid Builds (Magic + Melee): If you use both magic and physical combat, you might want to balance your flask allocation more evenly between Cerulean and Crimson flasks, depending on whether you need more healing or more FP for skills and spells.

6. Location and Acquisition:
The Flask of Cerulean Tears is a starting item, given to you early in the game as part of your Tarnished loadout. However, you can increase its effectiveness and utility through upgrades.

Sacred Tears are obtained at Churches of Marika and other special locations across the Lands Between.

Golden Seeds are found in various locations, often near key areas like Sacred Sites or on the way to major landmarks in the world.

Conclusion:
The Flask of Cerulean Tears is an absolute necessity for any character using magic or relying on weapon skills in Elden Ring. It provides the much-needed resource to keep casting spells, performing powerful attacks, and using your special abilities in the heat of battle. Efficiently managing your flasks and ensuring that you’ve upgraded them can make the difference between life and death when facing the toughest enemies and bosses in the game.

Always keep an eye on your FP and use your Flask of Cerulean Tears strategically—whether you're pulling off a deadly sorcery or a devastating weapon skill, this flask will ensure that your magic and buy Elden Ring Items abilities never run dry.