Why are caesura alliteration and the kenning so difficult to translate?

Caesura, alliteration, and kenning are challenging to translate because they are poetic devices unique to Old English and Old Norse poetry. They often rely on the specific sounds, rhythms, and cultural associations of the original language, making them difficult to capture in another language without losing their full effect and meaning. Translators must find creative ways to convey these complexities while preserving the integrity and poetic qualities of the original text.