The phrase "fall on" can be replaced by various synonyms to create a more descriptive sentence. For example, "descend upon" can be used to suggest a sudden and forceful arrival. "Strike" can imply a sudden and unexpected impact. "Occur" suggests something happening naturally or predictably. "Veil" can be used to suggest an event shrouded in mystery or darkness. "Settle" describes something coming to rest peacefully or quietly. Each synonym offers a different perspective or connotation, allowing the writing to convey more nuance and depth. Careful consideration of word choice can make all the difference in creating compelling writing.