the trait magical knack increases your caster level by +2 in regards to one spell casting profession. does this bonus apply when making concentration checks (for example defensive casting) for said profession?
YES. Magical Knack increases your caster level (for a particular class, not to exceed your hit dice). It applies whenever your caster level is called for.
the trait magical knack increases your caster level by +2 in regards to one spell casting profession. does this bonus apply when making concentration checks (for example defensive casting) for said profession?
Yes.
Concentration: "When you make a concentration check, you roll d20 and add your caster level and the ability score modifier used to determine bonus spells of the same type."
So long as you actually benefit from it. Meaning if you're a level 6 wizard, your caster level is still 6. But if you're a level 4 wizard / level 2 fighter, then your caster level would be 6. Magical Knack.
the trait magical knack increases your caster level by +2 in regards to one spell casting profession. does this bonus apply when making concentration checks (for example defensive casting) for said profession?Yes.
Concentration: "When you make a concentration check, you roll d20 and add your caster level and the ability score modifier used to determine bonus spells of the same type."
So long as you actually benefit from it. Meaning if you're a level 6 wizard, your caster level is still 6. But if you're a level 4 wizard / level 2 fighter, then your caster level would be 6. Magical Knack/
Yep. That's a great trait if you're multiclassing as a caster. Otherwise, if you're just looking for a boost to concentration checks, focused mind works rather nicely.