Erin's weapon was said to be divided into five different stages, but few had the strength to force him to fully utilize all forms in combat. Usually, Erin only kept it at the second stage, since the Sniper Form allowed for both long-range attacks and close combat capabilities. Erin's five weapon forms were: The first stage, Bone Knife Form, the second stage, Sniper Form, the third stage, Mimic Form, the fourth stage, Spirit Form, and the legendary ultimate form, King Form, which had never been used. The first stage, the Bone Knife Form, and the second stage, the Sniper Form, only required adjustments to the weapon's appearance and were the easiest to switch between. However, for forms above the third stage, new parts needed to be assembled into the weapon. So, wherever Erin went, he carried a strange backpack that resembled a beetle on his back. And what was inside the backpack were the main parts that allowed him to advance his forms… bug stars! They were pale blue crystal
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