The Countess's extra rune drops on hell difficulty can include Ist runes. The Hellforge on hell difficulty has a 1 in 11 chance to drop an Ist rune as part of its quest reward. The Act 5 (N) Good treasure class has a chance to drop an Ist rune, as do higher Good treasure ...
A Lum rune is a low-mid rune which can be socketed into equipment in Diablo II: Lord of Destruction. In open and ladder games, Lum runes are useful for upgrading unique weapons to elite versions. Socketing an item with a Lum rune increases the item's lev