Buy Moonstones with the Krat Supply Box

Polendina’s shop at Hotel Krat after returning the Krat Supply Box found in St. Frangelico Cathedral Chapel.

Before you go

Explore St. Frangelico Cathedral Chapel along the main route until you find the Krat Supply Box pickup.
Collect the box and return to Hotel Krat when convenient.
Speak with Polendina and deliver the box to expand his inventory.
Open the shop stock and look for Hidden Moonstones and Dark Moon Moonstones of the Covenant.
Check the next enhancement requirement for your selected weapon at the weapon upgrade service.
Buy only the material that matches the intended normal weapon upgrade, then apply it through the enhancement menu.

Compare the item name and tier against the weapon menu; Moonstone families are not interchangeable.
If Ergo is short, wait to buy until you know which weapon you plan to keep upgrading.

The box delivery is one-time per playthrough and expands shop stock. Purchases are constrained by that stock; this is not an enemy drop loop.

Do not leave the box in inventory and expect the expanded stock to appear; deliver it to Polendina.
Do not buy a Covenant stone for a normal weapon upgrade without confirming the requirement.
Do not assume shop stock renews indefinitely; treat the added materials as limited.

Stop when the needed material is purchased or the relevant stock is exhausted; then use fixed pickups or eligible enemy drops for further upgrades.

Sources & fact checks

Open a guide to find other locations and see what the item is used for.

Blade upgrade materials

Expand Polendina’s stock with a chapter pickup and buy the upgrade materials that support your normal weapon path.