Blue
Ravenous Bugblatter Beast of Traal
Fine by me. If a player wants to be a rules pedant rather than a flexible player, well...that's a style of game play I can do without.
Are you are equally flexible - if they don't like that your are nerfing class features without warning after character creation, are you perfectly happy to let them recreate a character? Let them bring in a new character of equal level and XP, and change any magic items/rewards to work with the new one?