The Countess’ rune drop table depends on the difficulty you’re playing on, whether it’s Normal, Nightmare or Hell.
What runes does The Countess drop in Diablo 2 Resurrected?
You can rely on your mercenary to do the heavy lifting, assuming a good loadout. In Hell difficulty, the Countess will always be Fire and Cold immune, so keep that in mind. Rising over the buried dungeons in that god-forsaken wilderness, a solitary tower, like some monument to Evil, is all that remains. …And so it came to pass that the Countess, who once bathers in the rejuvenating blood of a hundred virgins, was buried alive… And her castle in which so many cruel deeds took place fell rapidly into ruin. The quest is activated by reading the Moldy Tome located in the Stony Field area of Act I.
Act I’s fourth quest, entitled “The Forgotten Tower,” requires players to explore the cellar dungeons beneath the Tower Ruins. You can find the entrance to The Forgotten Tower around the Black Marsh waypoint by looking for an abandoned stone structure. The Countess is located on the fifth floor of The Forgotten Tower in the Black Marsh.