Crossfire didn't have random events when praying, unless you count flowers firing in all directions to "renew your faith" (negative grace) an event. The events were only applicable when praying on top of an altar, and IIRC, this is the complete list:
- hp/mana/grace restoration
- getting a special prayer related to the deity (the god of electricity had some electricity prayers, the undead one had some deadly diseases IIRC, etc)
- curse/damnation removal on all items
- depletion healing
- various healing spells (restoration, cure poison, etc depending on the god)
- enchanting weapon (slaying the god's enemy, getting it up to +5 or so, etc)
- some presents (holy symbols, weapons, etc of the god)
I'm not sure plain praying having such effect is a good idea. The plan is to eventually implement the 'consecrate' prayer, which consecrates altar you are standing on to your god. There are already dungeons with altars, so such places would be used quite a lot I think (it also means you have to do something in order to get some nice help -- deities usually don't stand next to a single person, checking all the time whether they are alright or need something; altars are more likely to get their attention).
Treasurelist implies that it's only for when you're opening a container (usually a mob's corpse) and receive a reward of some sort....
Treasure lists are not for containers; they are assigned to monsters to define what they should be (randomly) carrying, ie, the loot is decided when the monster is spawned, not when looted. Any entry in a treasure list can have a chance set, which controls how often it should 'drop'. In the case of deities for altars, it's some system objects that randomly drop and then the code decided what to do depending on what object actually dropped -- 99% nothing drops, although that's controlled by the code; god intervention is very rare.
for some more details.