Nihlathak Level

[Jarulf]

Actually, not right.  Superuniques always get the +3 to their mlvl.  However, the base mlvl follows the same rule as other monsters: if the "boss" column for that monster in monstats.txt is set to 1, or if it's in normal difficulty, then the level in monstats.txt is used as a base, and 3 is added to that.  This is what happens to Nihlathak.  If the "boss" column is blank, and it's in nightmare or hell, then the area level is used and 3 is added to that.  That's what happens with all the Baal-summoned superuniques.  They're all mlvl 88 (85 + 3).

Also, the putrid defiler type monsters all have a 1 in their "boss" column, so those also use the monstats.txt levels as their base, just like act bosses.  Champions would still get +2 and bosses would still get +3.

Also, missing from your list are minions, which also have a +3.
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One addition, the "act-end" bosses includes some other special monsters as well that won't get the +3 level. Of hand, I think it would be Radament, Summoner and Griswold, possibly someone else and perhaps not one of them. Basically, all special boss monsters with their own monster type but NO entry in superunique.txt . They would all have the "boss" column set to 1 I suppose, hence why they turn out shown as bosses in the game. Also note that those monsters won't get any of the other super unique mods (like increased HP and such that super uniques get with their level increase).

EDIT:

Also, to make the "list" better and more correct and also to handle differences between difficulties and perhaps patch changes or olde versions for info, I would rather say:

Champion monster Level = Base Monster Level + 2

Boss monster Level = Base Monster Level + 3

Superunique (those listed in superuniques.txt only) Level = Base Monster Level + 3

Minion Level = Base Monster Level + 3 (was +2 I think pre 1.10)

Special Boss Level (mostly act bosses) = Base Monster Level

Base Monster Level = monstats.txt in normal difficulty
Base Monster Level = area level, in levels.txt, in nightmare and hell difficulty except for Base Monsters listed as Bosses (would mostly be the Special Bosses)