One of the toughest assignments to complete in Atelier Escha & Logy: Alchemists of the Dusk Sky DX is the Core Delivery assignment, not because it’s difficult, but due to the lack of knowledge of how to obtain the proper items to fulfill the task.
Details of the assignment:
“Delivery Cores! Central City has requested them to further advance alchemic research. Take them to the Town Entrance. Requirements: Deliver 4 (Core) to the official at the Town Entrance. Memo: 4 of (Core), or 1 Airto Blitz. You can mix and match.”
There are two ways to complete the assignment, and they are:
(Core) is vague, but it really means the category “Core”. Items of the category are Flava Blitz, Guryun Blitz, Roten Blitz, Tauzent Blitz, and of course, Airto Blitz. To get the recipe for an Airto Blitz, you must get the Lady Mauselle alchemy book, however, finding it is a challenging task because the Dragon’s Nest area (more specifically, Dragon’s Left Wing) is not available yet.
The easiest way to complete the assignment is to make four Guryun Blitz items under the Attack category of the synthesis menu. The materials used to make the Guryun Blitz are the most common out of the four items you can create.
Make four of the Guryun Blitz items and deliver them to the guy waiting at the Town Entrance to complete the Core Delivery assignment. Alternatively, you can skip the assignment and do it over in your final year. By then, you should have the Lady Mauselle alchemy book and be able to take advantage of the Airto Blitz recipe to make and deliver one item instead of four.