
If the character has made a covenant with the god in question, then the odds of intervention are 10+[level]%. If successful, there is a [level]% chance an actual avatar of the god appears. Otherwise, it's just a servant or a spell, or something more subtle.
So for Gobax, at level 5, there's a 15% chance of success, and a 5% chance Sirrion himself will actually appear in some form.
(I realize those odds are fairly high, at least in terms of divine intervention, but the gods of Dragonlance are very much known to meddle in the setting. Heck, as we speak, Paladine himself is pretending to be a befuddled old wizard and hanging out with the Heroes of the Lance.)
If you want to search remains for surviving magical items, I can roll saving throws against magical fire for what they had and see if anything is left.