Embracing that impulse, Svin howled.
As he did, his body split.
The thorned monstrosity shook as if bewildered, causing the sudden group of Svins to
smile.
"This is what a Phantasmal Body can do."
In short, he split his magical energy down the middle to make copies of himself.
He hadn't used the technique against Touko because he was sure she could see through
to the original, and in short order neutralize the spell. Against this tentacled monster
though, there was no fear of that.
All at once, the six Svins charged.

The Case Files of Lord El-Melloi II, Volume 3, Chapter 3, Part 5