Nepstrius, known as Neptune (ネプチューン, Nepuchūn) in Japan, is an Energy Layer released as part of the Burst System. It debuted with the release of the B-28 Booster Neptune Armed Zephyr on January 23rd, 2016.
Nepstrius is a six-bladed Energy layer with six smooth wave like blades.The center of the Energy layer depicts the Japanese namesake; Neptune, the sea god in Roman mythology.
The round shape and smooth sided blades create a low recoil design which deflects attacks, giving this Energy layer high defense potential. Furthermore, majority of the weight of Neptune is focused around the perimeter creating high outward weight distribution and flywheel effect giving Neptune high stamina properties. The Takara Tomy release of Neptune features one tall tooth, two medium sized teeth and one short tooth, which combined with its low recoil design makes it very hard to burst.
Overall, Neptune was once a Top-Tier Energy layer for Stamina/Defense Customizations. However, with the release of the Switch-Strike/God Layer System, Neptune has become too light to remain competitive.
As such, Neptune is only suitable for collection purposes.
Differences in the Hasbro Version
The Hasbro release of Nepstrius features very weak slopes making it extremely prone to burst finishes. The Flywheel effect is also severely reduced making it outclassed by layers such as Yegdrion and Kerbeus, stamina wise. Furthermore, there is a small blade present in the opposite direction of other blades which creates a new point of recoil which reduces further reduces stamina and increases the Burst risk.
As such, the Hasbro release of Nepstrius is suitable for only collection purposes.