I am absolutely 100% positive on this one. She can drop up to Lo, and Lo only. That is a fact. Actually, everything Evrae said was true.
Also, her minions can drop up to Zod, so it is possible to see a Zod in Tower lvl 5, but it won't be from the Countess.
Edit:
And just to throw some outside proof into the mix, here's an excerpt from the
Item Generation Tutorial-
18. The Countess
There is no need to explain her drops in separate chapter, she isn't special. However people usually accent their attention on her, because she is excellent source of middle level runes.
That is why I decided to give her special chapter. (I hope she will give me a Lo rune in return ;-) )
I'll give the word to Dr. Thrugg at beginning.
Quote:
Originally Posted by
Thrugg
"Ah, the Countess. Most complicated TC by far. You'll note she has a -2 in her TC row; that means she gets 2 drops but that they are not random, she drops left to right across her TC until she reaches 2. Since her TC contains only Countess Item 1 and Countess Rune 1, it means she drops once from each of those TCs.
Countess Item has 5 drops as you saw. It is otherwise not much different than the other special monster TCs. She has a no-drop of 19 (very important) and gold, equip, junk, good. She will do all 5 of these drop attempts first.
After the Item drop she moves on to the Countess Rune TC. This has 3 drop chances with a simple 5/20 no-drop and 15/20 direct from a Rune TC for those yummy runes. However, remember the 6 drop limit. This isn't a limit on drop chances, just on total drops. If she drops 5 items in her Item drop, she can only drop one more from the Rune (although she still gets 3 chances to do so). Best for us is if she drops less than 5 items from the Item drop so there is room for all 3 Rune drops. Complicated. Only monster where it is actually better to kill her on p1, so nodrop is higher, so Item drops are less etc."
Let me look at her drops more closer. She drops from her own TC, "Countess" in Normal, "Countess (N)" in Nightmare and "Countess (H)" in Hell.
I'll look at most interesting TC, "Countess (H)", others are just similar.
"Countess (H)" ALWAYS do one drop from "Countess Item (H)" TC and another drop from "Countess Rune (H)" TC.
"Countess Item (H)" TC may do 5 picks from "Act 2 (H) Good" TC with 3/67 chance of each in /players1 mode.
"Act 2 (H) Good" TC may do one pick from "Runes 14" TC with 14/130 chance.
"Countess Rune (H)" TC may do 3 picks from "Runes 12" TC with 15/20 chance of each in /players1 mode.
"Runes 14" TC contains all runes up to Lo.
"Runes 12" TC contains all runes up to Ist.
So, Hell Countess has 1-(1-(3/67)*(14/130))^5=2.39% chance to drop at least one rune from El-Lo range, and (1-(5/20)^3)=98% to drop at least one rune from El-Ist range. That is why she is so popular.