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 features a six-blade design with two big, two medium and two medium-little others with very smooth sides. It depicts Neptune, the sea god in the Roman mythology.
The colored plastic underneath the transparent casing is focused in the out perimeter and four ways linking the out perimeter to the center. This balances the weight between the inner side and the outer perimeter.
Nepstrius is a very well balanced Energy Layer which has decent attack, good defense with moderated stamina.