>>96794004
You mean something like Rho Aias the shield of archer from fate a conseptual layered defence but that if broken damages the user.

>>96794005
>>96794032
I am using exalted as a source of inspiration and yeah they might work
>>96794045
in exalted there used to be 4 limits to not spam invulnerability against everything.
>Compassion
You can only use them when in the presence of something or someone you love
>Valor
Can only be used against the most powerful enemy you are fighting.
>Temperance
Can only be used with a calm and collected state of mind
>Conviction
When the fight furthers your most deeply held goals.

That and also having to spend magic points.