Answer:
Consonance.
Explanation:
'Consonance' is demonstrated as the literary device that involves a succession of similar consonant sounds usually at the end of syllables or words without resembling the vowel sounds in a single line(sentence) or phrase. The chief aim of employing such a device is to create a rhythmic and melodious effect that would captivate the readers' attention and appeal to them. In 'abstruser musings', there is a quick succession of consonant sound 's' while in the phrase 'That was a stroke of luck', the use of consonant sound 'k' repetitively creates the rhyming effect. Thus, 'consonance' is the answer.