oh baby a triple

“...I see,” Stiyl said while just barely managing to stay on his feet while balancing himself
with a hand on the wall. “I’m up against 103,000 grimoires. I guess it isn’t too surprising
I can’t oppose you with just one Innocentius.”
However, he continued to speak.
“But I never said I had only one trump card.”
An explosive noise rang out.
There was a flame giant next to Stiyl.
However, it was not just on the right or on the left.
There was an Innocentius on both sides.
“Double.”
Index stared at that phenomenon for a bit.
Finally, she opened her mouth to speak with her eyes as emotionless as ever.
“Chapter 21, Verse 44. Constructing a countermeasure to multiple targets. Activating it
imme—”
But then...
“Triple.”
Another explosive noise rang out.
Index’s voice suddenly stopped. It seemed she was considering whether the command
she was in the middle of stating would get in her way or not.
Stiyl was expending a massive amount of magic power which meant he was also
expending a massive amount of his life force that was the raw material for magic power.
He knew this, but he still smiled while sweating profusely.
“Did you really think I would just ignore what I was capable of just because I knew I had
insufficient power back there?”

Of course, Stiyl could not use three different Innocentii at one time using just his own
power. No matter how much one redesigned a spell, there were some things that were
simply beyond the level of what an individual could accomplish. Stiyl had not surpassed
that barrier.
Instead, he had made up for what he lacked with the spiritual items within St. George’s
Cathedral.
Stiyl had been running around in order to find, gather, and use the materials he needed.

- Toaru Majutsu no Index Volume 21, Epilogue