It must be said, Gray's Unique Skill indeed has its special aspects.
In the field within sight, he can turn attacks into invisible beasts, which then pounce and bite at the enemy, and it's not just limited to one; he can form multiple invisible beasts to create an assault.
If this capability has no major limitations and can form invisible beasts at will, then Gray would only need to sit atop, overlooking the battlefield, and even against an army, he could fight them off single-handedly, wouldn't he?
Even if the enemy can detect the presence of invisible beasts with extraordinary perception, they can only evade, unable to devise any other countermeasures against these invisible beasts.
Because they are essentially attacks, not creatures, nor invisible aides; they are not only invisible but intangible, even swinging a sword would hit nothing.
