Enchant Weapon: Lifestealing Farming Location (Classic - WoTLK)
The only location in the entire game that you can farm the Formula: Enchant Weapon - Lifestealing is from the Spectral Researchers in the first room of Scholomance. If you're running this dungeon with a regular group, unless you're doing a quest you'll most likely skip the majority of the first room with the Spectral Researches in it.
You'll find about 6 of these enemies in the first room of Scholomance and depending on your group composition they can be either really annoying or really easy. Spectral Researches have an extremely annoying AoE knockback mana burn which will make mana users absolutely hate these mobs and make most groups want to just avoid them.
If you're running a regular Scholomance run, you can easily defeat two or three of these enemies while normally progressing through the dungeon. The rest of them, however, you'll have to convince your group to go out of their way to defeat them.
Click to enlarge the map above.
Along with the Formula for Lifestealing you'll find a ton more items throughout Scholomance that make it profitable to farm here. The biggest one worth mentioning is the Dark Rune, which drops from Scholomance Necromancers and Scholomance Dark Summoners, both of which commonly found in the first room after the Spectral Researches.
These are the droppable version of Demonic Runes and you'll be able to sell these for a couple gold each to raiders for all of Classic WoW. Of course since this is a level 60 instance you'll find a ton of Runecloth, gray items and greens here as well.
For those of you in a raiding guild that are reading this, when your guild does its weekly Flask runs through Scholo that would be a good time to convince some people to farm this enchant with you. Since they're already coming to this instance for something other than clearing it, most people probably will not have a problem clearing the first room of trash.