TheWoWDB
Item 12808 on Classic Era (Classic Era, Hardcore and Anniversary realms), client 1.15.9.68940
Essence of Undeath is an uncommon reagent item on Classic Era at item level 55. Recipe: Transmute Water to Undeath teaches how to make it. 6 recipe items on Classic Era list it as a reagent, including Plans: Corruption, Plans: Annihilator and Recipe: Transmute Undeath to Water. A vendor pays 10 silver for it.
No Classic Era price data yet. Blizzard does not publish Classic Era Auction House data through its API (every Era auction house answers 404, US and EU). The scanner checks every hour; this page fills the moment Blizzard turns it on. Until then, use the in-game AH or the TheWoWDB Companion addon on your realm.
Recipe: Transmute Water to Undeath (1x Essence of Water) Requires Alchemy (275)
Plans: Corruption (40x Thorium Bar, 2x Arcanite Bar, 8x Essence of Undeath, 2x Blue Sapphire, 2x Dense Grinding Stone, 4x Rugged Leather) Requires Blacksmithing (290)Plans: Annihilator makes 
Annihilator (40x Thorium Bar, 12x Arcanite Bar, 10x Essence of Undeath, 8x Huge Emerald, 2x Dense Grinding Stone, 4x Enchanted Leather) Requires Blacksmithing (300)Recipe: Transmute Undeath to Water makes 
Essence of Water (1x Essence of Undeath) Requires Alchemy (275)Pattern: Robe of the Void (12x Bolt of Runecloth, 40x Felcloth, 12x Essence of Fire, 12x Essence of Undeath, 2x Rune Thread) Requires Tailoring (300)Schematic: Ultra-Flash Shadow Reflector makes 
Ultra-Flash Shadow Reflector (8x Dark Iron Bar, 4x Truesilver Transformer, 6x Living Essence, 4x Essence of Undeath, 2x Azerothian Diamond, 2x Large Opal) Requires Engineering (300)
Plans: Persuader makes 
Persuader (15x Arcanite Bar, 10x Dark Iron Bar, 20x Essence of Undeath, 20x Dark Rune, 10x Devilsaur Leather) Requires Blacksmithing (300)| Item 12808 | Classic Era | MoP Classic | Retail (Midnight) |
|---|---|---|---|
| Item level | 55 | 55 | 10 |
| Sell price | 10 silver | 10 silver | 10 silver |
Retail recipe Transmute: Water to Undeath: 1x Essence of Water.
Retail recipes that use it: Annihilator, Apothecary's Worktable, Axe of Sundered Bone, Belt of the Mentor, Bindings of the Harvested Soul, Blade of the Fallen Seraph, Blade of Unholy Might, Brill Coffin, Brill Coffin Lid, Corruption, Cursed Cloth and Darkmaster's Mystical Brazier.
Connected realms with a listing in the latest Classic Era scan: EU 0 of 26, US 0 of 23.
Item data: Blizzard's Classic Era Game Data API (static data 1.15.9.68185). Prices: per-unit buyouts from one Blizzard Auction House snapshot per connected realm per hour; market is the quantity-weighted median of a realm's listings. Retail column: the retail client datamine.
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