The term 'grand-scale poem' can be broken down into two crossword solutions: EPOPEE (6 letters) and EPIC (4 letters). An epopee is a long narrative poem that tells the story of a heroic figure, while an EPIC is a long narrative poem that celebrates the deeds of a legendary or traditional hero. Both epopees and epics are typically grand in scale, with stories that span multiple generations and involve a large cast of characters.