@ChrisPerkinsDnD I want to mod a dragon to cast spells. If I let him do it as a legendary action, is that likely to change the CR?

— James Geluso (@atlemar) January 21, 2016

Adding a spell that significantly improves the dragon's damage output or defenses could affect its CR. https://t.co/90nwVaFOsv

— Christopher Perkins (@ChrisPerkinsDnD) January 22, 2016