إِيَّاكَ وَالْأَسَدَ
Translation: Beware of the lion!
إِيَّاكَ: detached accusative pronoun, object of an unexpressed warning verb.
وَ: linking wāw, analyzed as coordination or accompaniment in grammatical accounts.
الْأَسَدَ: accusative noun naming the danger, parsed within the warning construction.
Iyyāka is not a particle or subject; it is an accusative pronoun.