Warlock

18 books. Every source is listed: one book often drops from several monsters and at different chances.

Lvl	Skill	From whom	Where	Chance	With premium
40	Mass Summon Storm Cubic	Leto Lizardman Overlord 40	Plains of the Lizardmen	0.25%	0.38%
40	Servitor Cure	Porta 40	Cruma Tower: 3rd Floor	0.25%	0.38%
40	Servitor Haste	Crokian Lad 41	Alligator Island	0.25%	0.38%
40	Servitor Magic Shield	Crokian Lad 41	Alligator Island	0.25%	0.38%
40	Servitor Physical Shield	Crokian Lad 41	Alligator Island	0.25%	0.38%
40	Summon Binding Cubic	Timak Orc Archer 41	Timak Outpost	0.25%	0.38%
40	Summon Kai the Cat	Timak Orc Archer 41	Timak Outpost	0.25%	0.38%
40	Summon Storm Cubic	Timak Orc Troop Archer 41	Timak Outpost, Oren Territory	0.25%	0.38%
40	Transfer Pain	Tamlin Orc 41	Hunters Valley, Aden Territory	0.25%	0.38%
52	Servitor Empowerment	Sanhidro 52	School of Authority, Oren Territory, Aden Territory	0.25%	0.38%
52	Summon Friend	Sanhidro 52	School of Authority, Oren Territory, Aden Territory	0.25%	0.38%
56	Arcane Disruption	Connabi 54	School of Authority, Oren Territory, Aden Territory	0.25%	0.38%
56	Betray	Connabi 54	School of Authority, Oren Territory, Aden Territory	0.25%	0.38%
58	Mass Surrender to Fire	Taik Orc Seeker 56	War-Torn Plains, The Cemetery	0.25%	0.38%
60	Servitor Blessing	Pallid Devourer 58	War-Torn Plains, The Cemetery	0.25%	0.38%
		Ravenous Pallid Devourer 58	War-Torn Plains, The Cemetery	0.25%	0.38%
70	Arcane Agility	Tulben 69	Aden Territory, Blazing Swamp, Field of Massacre	0.25%	0.38%
72	Excessive Loyalty	Hames Orc Sniper 71	Aden Territory, Blazing Swamp	0.25%	0.38%
75	Summon Feline King	Cinderveil Reanimator 74	Blazing Swamp	0.25%	0.38%