Final answer:
The allusion to Elysium in the serenade poem creates an enchanting and beautiful atmosphere while also adding depth to the poem's themes of transcendence and escapism.
Step-by-step explanation:
The allusion to Elysium in the serenade poem creates two effects. First, it adds a sense of enchantment and beauty to the poem. Elysium is described as a paradise in Greek mythology, so by alluding to it, the poem evokes a feeling of a magical and perfect world. Second, the illusion to Elysium also adds depth and richness to the poem's themes. It suggests that the poem is exploring ideas of transcendence, escapism, and the desire for a utopian existence.