There once was a wizard of great renown, the truth of his power hidden away held in the gems that lay upon his crown so not even friends, his trust could betray. Surprised one morning to hear a voice say, Manfeld the Arcane, truly thou art cruel, at midday today you and I shall duel. The wizard smiled, confidence abound. You must be a fool to challenge me so, you cannot win without my weakness found; it has been guarded well, you cannot know. The challenger laughed, a laugh oh so low, reaching into a sack hung at his thigh. I have here your weakness, today you die.
What is the wizard's weakness?
The number of lines and number of stanzas are important to the solution. The rhyme scheme and number of syllables are superfluous.
The words in the poem don't matter at all for the answer. There's something else in the poem that can be extracted and decoded to an answer.
Look for something that can be turned into binary representation.