Demonology Warlock
Rotation
Opener: Summon the Felguard-less Classic roster: Succubus for single target, Voidwalker to tank; Corruption, Curse of Agony, Shadow Bolt.
Priority: Demonic Sacrifice (Succubus) for +15% shadow damage in raids, then Shadow Bolt with Corruption and the curse up. Soul Link with a Voidwalker for leveling and PvP.
Cooldowns: Fel Domination to resummon instantly; Soulstone the main healer before the pull.
Forever notes: Demonology is a support tree in Forever: Master Demonologist and Demonic Sacrifice feed the Destruction damage.
Stats
Spell Hit to 16%, spell power, Stamina (Soul Link and Life Tap), Intellect, then Spell Crit.
Demonic Knowledge turns pet stats into your spell power; pet survival gear is your gear.
Numbers for every spec and a gear comparer: stat weights.
Where it ranks
See the tier lists for PvE and PvP placement, and Classic vs Forever changes for what Blizzard altered in this class.
Wowhead and Icy Veins keep spec guides of their own: Icy Veins Demonology Warlock, Wowhead class guides. Our rotation notes are editorial, written for the Nov 2 tuning.