Demonic Knowledge
Hand of Gul'dan has a 5% chance to generate a charge of Demonic Core.
Tree position
In the Demonology Warlock talent tree, Demonic Knowledge sits in the Demonology specialization talents, row 8 of 11. It takes 2 points to fill. Its row opens once 20 points are spent in Demonology Talents.
Connected above
The tree draws a line into Demonic Knowledge from Spiteful Reconstitution.
Spiteful ReconstitutionIncreases Demonbolt damage by 10% and consuming a Demonic Core has a chance to summon a Wild Imp.
Connected below
Demonic Knowledge leads on to Doom and Hellbent Commander.
DoomWhen Demonbolt consumes a Demonic Core it inflicts impending doom upon the target, dealing (403.1% of Spell Power) Shadow damage to enemies of its target after 20 sec or when removed. Damage is reduced beyond 8 targets. Hand of Gul'dan reduces the duration of Doom by 3 sec.
Hellbent CommanderYour demons deal 1.1% increased damage for each demon you control.
Same row
Also on this row: Sacrificed Souls, Reign of Tyranny, Master Summoner and Demonic Calling.
Sacrificed SoulsShadow Bolt and Demonbolt deal 2% additional damage per demon you have summoned.
Reign of TyrannyYour Demonic Tyrant lasts an additional 5 sec and extends the duration of your Dreadstalkers by 15 sec when summoned.

Demonic Calling2 ranksCall Dreadstalkers costs 1 less Soul Shards and its cast time is reduced by 50%.
Talent trees
Demonic Knowledge is in the talent tree of 3 specializations. Warlock: Affliction (DPS), Demonology (DPS), Destruction (DPS).
Demonic Knowledge Changes by patch
Tracked changes to this talent between game data builds, newest first.
- First tracked in the game data (patch 12.1.0)