Destroy the Big Bad

Six
    Cadaeics


Conundrums, conundrums, conundrums...nonsense! I needed some outdoor atmosphere. Taking Cambridge's Literature, I opened a door, waved my hand, commenced a promenade.
"I'm a Cadaeic!"
Huh?
"I'm a Cadaeic! I'm a real Cadaeic!", shouted an old woman.
Astonished, I took a step back.
"A veritable Cadaeic, old woman? Really?" Cadaeics' myths were numerous. A clique, a new mystic association, whose members had...power. An eerie power. So, I was now most curious. Still, staying calm, I placidly said, "Elucidate more, please."
"Cadaeics have," she murmured, "power. Do you?..."
"Yes, so I've intimated. Regardless, . . . Cadaeic? You apprehend this?" I said.
"Yes, sir. The true power lies greatly, heavily, within me."
"What," I softly inquired, "manner of power? A strength? telepathy? learning?"
"The power" (thusly continued that wizardly woman) "makes change in paralleled, tunneling universes. As I cultivate it, it is a powerful good, an element of great peace. Deplorably, he - Surta - uses it quite evilly, altering original Cadaeic intent."
"Changes? A Cadaeic scoundrel generating wild mutations? This, though intriguing, I cannot quite see. This humble spirit requires validation - your narrative produces numerous doubts!"
"My apology, oh sir - I'm utterly desperate. A Cadaeic normally avoids 'incapables', enjoying other Cadaeic contacts only. Can, stranger, you befriend me? Cadaeic existence - indeed, people's existence - demands prompt action."
Startled, I then asked, "What? A pedestrian incapable's worthless skill?"
"You, stranger, treasure the crucial analytic skills. Our people undervalue numerical ideas, preferring arcane, mystical, Cadaeified philosophy. Please help! Oh my Surta! O my Surta! Oh, lamentable Surta! O!"
I replied, "Yes, outlander, I'm available, amenable - also, somewhat numerical. Please, completely disclose:
  When I am expected,
  What assorted mathlike topics to review carefully,
    plus
  Where Surta's mysterious home is."
"Come, I recommend, before seven on tomorrow night (Michaelmas it is). Of a mathematic nature, review mensuration, infinite series, and trisection. Surta's shadowy home? Meet me. Cadaeic fortress awaits."
As my rendezvous was concluded, I meandered back, returning home.
"Quite impossible, what?", thought I. "An old Cadaeic, a bad Cadaeic...mythical powers subverted, indeed!" Regardless, curiosity still stayed. The woman's plea was serious, I concluded.
I desired an easement - perhaps more poetry. Opening Oxford's volume near "Poetry, Eliot", stanzas quite strange yet notorious filled my eyes. I saw Prufrock Lovesongs remarkably modified, thusly:

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