Riddle help, first one gets best answer

Question

i have to write a riddle and i dont know what to write. i have to add 3 kennings, an alliteration, an assonance and a caesura. it has to be 5-10 lines. first person to give me one gets best answer

Answer 1

Slide for swallows  medium for milkweed

End for all fishes  needed as eating

Used by You  thus far untaxed

Answer: air