By focusing on the grains, Ir'Houwl could make them change their property, or in other words, she would switch what it was they they drained from their victim, and by having them cycle through a selection of them, these few grains that would only have a small success in absorbing a single thing were eating away at multiple at once, and naturally, the disorienting effect that brought upon the target was simply glorious.
She had since long graduated from only being able to drain water, blood or mana, she had learned how to drain every known energies, it was a shame that she had not yet grasped how to do the same for vapour, but it was fine, although Ny-Hor had not knowledge, and thus, made no use of all other energies, having his inner energies eaten away like this was prone to cause an adverse reaction.