He can do at most three resurrections a day, given notice by the evening before that he should prepare the spell for it, of anyone with remains available who died within the last hundred and fifty years, unless they died of old age. It's also possible that someone will decline to return; he's never had it happen but there is a risk of it. (He'll refund his portion of the cost of the spell if that happens, unless he's warned them ahead of time that he thinks it's likely and they've asked him to try anyway; the offering will still be used in any case.) Payment and offering are as he's already discussed; the offering doesn't strictly have to be diamonds, but it does have to have the same value, and there's a chance of anything else being rejected; he can check with another spell whether it will be, if needed.

He doesn't want to bring anyone back who might restart the war, or start another one, or generally make significant trouble like that; he may be willing to bring people back in spite of that kind of risk if they'll accept him using additional magic to reduce it. He'll want enough information about the people he's bringing back to judge the risk of that. If he gets a request to not bring a particular person or group of people back he'll also take that into account. And this is a relatively time-limited offer: as a cleric of the god of travel he doesn't stay in one place very long as a rule; he expects to be comfortable here for a month, perhaps two if it ends up being convenient to make lots of day trips to interesting places, but he's eventually going to want to go - though of course he can come back later, if there's unfinished business here.