At the end of the description of Holy Word it says "Creatures whose Hit Dice exceed your caster level are unaffected by holy word." So if a Marilith (16HD) is in the areas of a Holy Word cast by a 15th level cleric, the demon does not have to save or be wisked away.
I just noticed this and I was wondering if I'm correct.
I just noticed this and I was wondering if I'm correct.