The skill tree does not include basic skills unless they are required to progress. Each skill requires every skill touching its box on the left. Hence, Rage of the Elements requires Plague Tent, Wizard's Reward and Tear of Asha Vision. In turn, Dark Ritual contributes to Death March, Secrets of Destruction and Twilight.

Warlock Complete Skill Tree
Warlock Skill Tree Rage of the Elements - Logistics, War Machines, Enlightenment, Luck	1Machines: Catapult	2Machines: Tremors	3Machines: Plague Tent	Rage of the Elements
	1Enlightenment: Arcane Intuition	2Enlightenment: Dark Revelation	3Enlightenment: Wizard's Reward
	Elemental Chains: Elemental Vision
	1Luck: Soldier's Luck	2Luck: Warlock's Luck	3Luck: Tear of Asha Vision
1Logistics: Scouting	2Logistics: Teleport Assault	3Logistics: Death March
	Elemental Chains: Dark Ritual
Warlock Skill Tree Attack, Destructive, Light		1Destructive: Secrets of Destruction		2Destructive: Mana Burst
		3Light: Twilight
1Light: Master of Wrath	2Light: Refined Mana
	1Attack: Tactics	2Attack: Power of Speed	3Attack: Retribution
	Elemental Chains: Empowered spells
1Leadership: Recruitment	2Leadership: Aura of Swiftness		1Dark: Master of Mind	2Dark: Dark Renewal
1Sorcery: Mana Regeneration	2Sorcery: Erratic Mana		1Summoning: Master of Conjuration	2Summoning: Exorcism
1Defense: Vitality	2Defense: Power of Endurance

Irresistible Magic						Warlock		#	Cheat Code
						Irresistible Magic		18	SKILL_INVOCATION
						Partially negates/Significantly negates/Negates half of/Drastically negates magic protection and allows hero to deal 20%/40%/50%/75% of normal spell damage to otherwise resistant creatures.
						Perk		#	Cheat Code
						Empowered spells		70	PERK_EMPOWERED_SPELLS
						All damaging spells cast by hero deal 50% more damage, but the mana cost is doubled.
						Dark Ritual		71	PERK_DARK_RITUAL
						Special adventure ability. Hero spends entire day to perform the ritual and regain full mana. Can only be used at the beginning of the day.
						Elemental Vision		72	PERK_ELEMENTAL_VISION
						Allows Warlock to see elements associated with each creature to help him to build and blow up elemental chains.
	Ultimate					Description		#	Cheat Code
	Rage of the Elements					Elemental chain effects inflict double damage.		150	WARLOCK_FEAT_ABSOLUTE_CHAINS