Modding

2) Here again, I'm not sure. There are no settings for this ability in DefaultStats.xdb. You can configure the magical strike of mummies/shamans (directly specify the spells and their mastery level), and you can change the numbers in the zombie attack debuff.
3) In the hero file for the map, for example, \MapObjects\Necropolis\Nemor.(AdvMapHeroShared).xdb, if you scroll to the very bottom, you'll see lines a little higher up that give the hero the Raise Dead spell.

2) I checked DefaultStats first. And I was surprised that there was no setting for this ability there. As well as the debuffs from the Shadow Lord's whip, by the way. Well, there is, but there's only a setting for the magic parameter, and that's it, although I vaguely remember that it was somehow possible to configure this ability (at least the mastery level). Or am I misremembering?
3) Oh, right! Thanks! For some reason, I thought it was somewhere in GameMechanics.