Terramancer

20 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	Aura Flare	Tanor Silenos 40	Tanor Canyon	0.25%	0.38%
40	Boulder Barrage	Grandis 40	Giran Territory, Death Pass, Neutral Waters	0.25%	0.38%
40	Elder Rune Bolt	Lienrik Lad 40	Field of Silence	0.25%	0.38%
40	Magnetize	Giant Fungus 40	Sea of Spores	0.25%	0.38%
40	Nature	Alligator 40	Innadril Territory, Alligator Beach, Alligator Island	0.25%	0.38%
40	Nature	Karul Bugbear 40	Hunters Valley, Aden Territory	0.25%	0.38%
40	Resist Earth	Lienrik Lad 40	Field of Silence	0.25%	0.38%
40	Sand Skin	Porta 40	Cruma Tower: 3rd Floor	0.25%	0.38%
40	Stone Gaze	Enchanted Monstereye 41	Ivory Tower Crater	0.25%	0.38%
44	Sleeping Cloud	Dailaon Lad 42	Alligator Island	0.25%	0.38%
48	Poisoned Dust	Nightmare Lord 47	Tanor Canyon, Giran Territory	0.25%	0.38%
48	Rune of Repeal	Nightmare Lord 47	Tanor Canyon, Giran Territory	0.25%	0.38%
58	Aura Flash	Luminun 58	School of Authority, Oren Territory	0.25%	0.38%
58	Earth Eruption	Pobby 57	School of Authority, Oren Territory	0.25%	0.38%
68	Mudslide	Abyssal Gatecaller 66	The Forbidden Gateway	0.25%	0.38%
70	Arcane Power	Conjurer Bat Lord 70	Aden Territory, Blazing Swamp, Field of Massacre	0.25%	0.38%
70	Terra Armor	Slagbound Colossus 73	Blazing Swamp	0.25%	0.38%
72	Earth Vortex	Hames Orc Scout 72	Blazing Swamp	0.25%	0.38%
73	Arcane Chaos	Hames Orc Footman 73	Blazing Swamp	0.25%	0.38%
74	Quagmire	Hames Orc Shaman 74	Blazing Swamp, Aden Territory	0.25%	0.38%