According to the 3ed rules, a baatezu killed outside his home realm is revived in the Nine Hells after 99 years and it is demoted by its lord.
A tanar'ri comes back to the Abyss immediatly and it is demoted by its own sense of failure.
Yugoloths, Demodands, Night Hags, amd eladrins just die.
But what about other outsiders?
I remeber that solars reforms in the Upper planes after 7 decades and planetar after 4. But what abouts the other aasimons, like devas and agathions?
And the guardinal the asures or the archons? The slaads and the titans the modrons and the rilmanis?
Does someone knows about this?
I know that if a Modron is destroyed a Modron from the next lowest caste is promoted. This leaves a gap so a Modron from the next one is promoted. That continues until a Monodrone is promoted and then a new Monodrone is created.