The black blade of Greed hummed in Klaus's hand, a living, vibrating entity that seemed to drink the remaining light from the shattered Eastern Tower chamber. Its obsidian surface, etched with malevolent violet runes, pulsed with a raw, predatory energy that mirrored the profound exhaustion now crashing over Klaus. His arm, still holding the newly solidified sword, trembled violently, not from weakness, but from the sheer, astronomical expenditure of arcane energy. Every muscle in his body felt like molten lead, his head swam with a dizzying ache, and his crystalline eyes burned. He swayed precariously, leaning heavily against the jagged remnants of the containment system, the cool, sharp edges biting into his skin, a desperate anchor against the overwhelming fatigue that threatened to drag him into unconsciousness. He had poured everything, and then some, into waking this ancient fragment.