"Reverential tones" refers to speaking or using a certain tone of voice that shows deep respect or admiration for someone or something. Full definition
You talk in reverential tones as if they are minnows on a shoe - string performing miracles through coaching alone. (justarsenal.com)
Indeed, some of the issues of this run should and will be spoken of in the same reverential tones as Frank Miller or Brian Michael Bendis's runs. (behindthepanels.net)
When his joke doesn't go over well, he follows it up by trying to take it more seriously, but so seriously it is also just as funny, as he makes a big to - do of it, holding his arms high in the air and affecting a mocking reverential tone to ask for the knife as he spins the prayer wheel — then spins it one more time to add the word, «Please.» (qwipster.net)