Questions about the Heroes 4 map editor.

In the fourth game, this chance is almost 100% (unless the enemies manage to loot him first).

In the fourth game, the skeleton disappears as soon as it is looted. Therefore, if a skeleton is present, the probability of finding an artifact on it is 100%.
And in treasure rooms, the level of the artifact should depend on the level of the treasure room. If desired, approximate probabilities can be measured experimentally. Make_macho_salad, what prompted this question?