Vampiric Embrace - Spell - Classic World of Warcraft

Afflicts your target with Shadow energy that causes all party members to be healed for 20% of any Shadow spell damage you deal for 1 min. Requires Priest.

PvE Shadow Priest Rotation & Cooldowns - WotLK Classic - Warcraft Tavern

Priest, Classic WoW Wiki

WotLK Classic Priest Guide - Pro Tips

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WoW Dragonflight: All Priest Talents and Abilities

Priest Guide (1-60)

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WoW Classic PvE Shadow Priest Guide - Warcraft Tavern

Your Shadow DOTs can last infinitely long in Dragonflight, if you put in enough time to build them up with Mindflay and the Talent Mental Decay, which effectively increases the DOT duration

WoW Classic - Shadow Priest PvE Guide - Spec, Rotation, BiS Gear

Vampiric Embrace - Spell - Cataclysm Classic

Vampiric Embrace, Vanilla WoW Wiki

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PvP Shadow Priest Rotations, Cooldowns & Abilities - WotLK Classic - Warcraft Tavern

Shadow Priest DPS Spell List and Glossary - Dragonflight 10.2.6 - World of Warcraft - Icy Veins