I was looking at the three act II (effectively Finale) quests available to me as the OL in the MoR mini-campaign and noticed something in the "Where the Heart is" quest:
In this quest, Skarn appears based on the presence of master monsters on the Basement tile. The number of master monsters on the same tile defines how much life he gets. Heroes can kill him, but he appears again based on the same rule at end of turn.
Now here's the thing, the quest rules say exactly this:
"At the end of each overlord turn, if 1 or more master monsters are on the Basement, the overlord may place Skarn in an empty space on the Basement with 1 health remaining. Then for each monster group with a master monster on the Basement, Skarn recovers health equal to the number of heroes."
The text doesn't stipulate that that Skarn must be dead (not on the Basement) to do this, so basically what I´m reading is that if Skarn is still alive at end of turn (and where he is doesn't matter) then I may decide to make him spawn again in the basement next to a master monster with new health total equal to the above calculation. Is this correct?