The weight of the ax Eren gripped held within it a bit of history.
It was a spoils-of-war, a trophy earned by vanquishing Behlam, bestowed upon Eren by the fallen enemy. Another axe of similar design was "gifted" by Behlam, creating a formidable pair that Eren named the Behemoth set.
Initially, the Behemoth axes held the status of Rank-1 artifacts, but recognizing their untapped potential, Eren sought to unlock their true power. At his behest, the axes underwent a transformative upgrade, ascending to the status of Awakened Rank. These enhancements were orchestrated by skilled artisans under the employ of the enigmatic bald merchant, Malcom.