Still Learning's page

The defeat illusion part of perception seems out of line. You weaken an already limited school of magic with a single already powerful skill. At the very least I think it should scale with caster level.

Profession -
I'm changing the oil so the engine doesn't blow up.
Why will it blow up?
Because it needs oil!
Why does it need oil?
So it won't blow up!

Knowledge -
If we don't put oil in the engine the pistons will generate too much heat from friction that would lead to catastrophic system failure.
Where do we put the oil in?
I'm not sure, let's see if its labeled.