Defensiveness coupled with extra attrition (+ defensive ideas perhaps?) sounds like invading them will be really tough. I'm all for!
they got even perma +1 attrition from arid climate so if you take defensive and high prestige and full piety you have 100% defensiveness and +3 attrition; welcome in the world of pain
If I'm not mistaken Afghanistan starts as a releasable state in 1444. So no Ironman Afghanistan for us
Is it formable in any way?
IIRC they start in 1.1.1450(?) as junior partner with Timmies with lost Persia.