Spell Integration + Compound Elemental Fusion
Eren had outgrown his reliance on the Blood Seeds for shape-shifting.
This marked one of the most significant advantages he'd gained since ascending to the B-Rank. He now possessed the liberty to seamlessly morph into the various races he'd procured Blood Seeds from.
Though his Shapeshifting had been relatively seamless even during his time as an Adept Ranker, it had become even more refined following the evolution of his B-Rank mana core.
The Tank from the Layos squadron, sent to quell him, had met his end at Eren's hands. Yet, this was merely the inception of his onslaught; a multitude of adversaries lay before him, ripe to experience the full force of his newfound powers. Determined and ruthless, he advanced, choosing to confront them individually, while his summoned creatures held the others at bay.
The battlefield was a discordant symphony of spell detonations and weapon collisions, the gravity of the situation rendering any taunts or banter obsolete.