The ground, littered with corpses, allowed him to cast "Death Exchange Technique (Tier Two) (Level 301)" anywhere he pleased.
This was the Ascended form of the "Death Substitute" Magic.
The "Death Exchange Technique" no longer required swapping before taking damage. Instead, it activated the instant damage was received, swapping in a corpse to take the hit. The damage would be transferred to the corpse, which would bear the full force of the attack.
This improved his margin for error. Additionally, its activation range, the number of consecutive uses, and the minimum required size of a corpse had all been enhanced.
Beyond that, there was one more, most valuable qualitative improvement.
He could finally use corpses that he hadn't killed himself. Now, any corpse would do.
But the cost also increased accordingly.
"Death Replacement" only required one soul with Spirituality at least equal to his own, but triggering "Death Exchange Technique" cost three.
On the previous 99 floors.
