This fish has a thin shell covering its face. The shell is not for protecting the fish, but for reducing resistance in the water, allowing it to move more quickly. The face cover and unicorn head are evolved from Loops
You can tell that it can swim pretty fast from its shape, but we don't know anything further than that. What on earth is that horn for?
The horn seems to be a sensor for sounds and vibration; thus you should use a mechanical lure with the ancient technique