"General, the Major has gone deaf."
Upon hearing Winters's words, Major General Layton turned pale, his eyebrows arching, his pupils slightly dilated, as he repeatedly asked, "What happened? How did he go deaf?"
What kind of person could make Major Moritz, who was both a spellcaster and a master of swordsmanship, go deaf?
It was he himself.
The thunderclap on the dock still filled Winters's ears with a faint screeching noise; that deafening thunder wasn't Zeus venting his anger or Thor swinging his hammer, but the effect of the Major's angry shout amplified by a sound spell.
Sound spells, including the one that caused the burst of sound, belong to the same category as sound amplification spells, but the former is simply a more powerful, intensified version of the latter.