Clarification requested regarding this question:
Q: Which upgrades continue to work on monsters that
are now under a hero's control as a result of using the
Necromancy skill.
A: Nothing counts. The newly animated monster does
not get any benefits from the overlord's powers, special
abilities, or upgrades of any kind. It is a monster of its
type of the
current campaign level
(i.e., Copper, Silver,
Gold). A necromancy-controlled Gold Beastman has the
exact stats on the “Gold Beastman” card and nothing else,
regardless of what upgrades the overlord has purchased.
Did you really mean a monster of the current campaign level? Or rather a monster of its current upgrade level?
Example: A Silver Beastman is necromancied during a Copper campaign - does it return as a Silver or as a Copper beastman?
If "Campaign Level" is really correct, how would a monster return during the Final Battle (which is a campaign level on its own)?