very imposing or impressive; surpassing the ordinary (especially in size or scale); "an epic voyage"; "of heroic proportions"; "heroic sculpture"

What does on a grand-scale mean?

: being or occurring on a large scale the grand-scale violence of a race determined to risk extinction— Anthony Boucher low water defeated hopes of grand-scale river navigation — American Guide Series: Minnesota.

What does Grand Council mean?

: an executive council in a high or supreme position especially as assistant to a governor or chief executive.