Originally Posted by
Theodoxus
Now, in my way of thinking, these types of boons require something akin to concentration. They can't be broken, so there's no concentration check, but they do require the same 'head space' that concentrating on a spell would take. Thus, you can't adopt a stance and concentration on a spell simultaneously. Does this bork Paladins or Rangers? Maybe. Though I think the option to use one or the other is a tactical decision that adds to the game. It keeps War Clerics from casting Bless and then stacking a saving throw stance at the same time. But it doesn't interfere with a Paladin's aura.