Defiler

20 - Yoppa's Rodent Form - Covers the form of the caster with an illusory image
20 - Baleful Countenance - Wraith form
21 - Revulsion - Int, Wis and Str debuff
22 - Degeneration - Slow, str and sta debuff
23 - Contamination - DoT poison + sta debuff
24 - Fulginous Sphere - Disease DoT + slow
24 - Reanimate - combat rez
25 - Abominus - Enduring breath + Disease DoT to attackers
26 - Curse of shielding - Ward and disease DD when target is hit
26 - Spectral guard - Ward + DD for attacker breaking the ward that heals the target for the same amount
27 - Devigorating Chant - Hate reducer + power drain
28 - Profane Accretion - Instant Heal
28 - Tained Orison - Cure arcane + power regen
28 - Vile Imprecation - Disease DD + arcane and noxious debuff
29 - Distill Soul - Places a soul essence used to heal in the inventory when target dies
29 - Putridied balm - Instand Heal + buff that can give DoTs to attackers
30 - Wunshi's foul sickening - Temporary forces another person to be sick
30 - Foreboding - HP, power, Defense buff
30 - Dire Effluence - HP group buff + ward absorbing noxious damage
31 - Seeping Eschar - Group ward + damage for attacjer that heals the group
32 - Aphotic Touch - AoE DoT and noxious debuff
32 - Dire Shroud - Str and AC group buff + chance of DD and heal
32 - Sacrificial aid - Heal, but decreases caster's HPs
33 - Vehemence - Group str and sta buff - can debuff attacker's offense when hit
34 - Sinister Countenance - Wraith form
35 - Loathing
35 - Tendrils of Fear - Slow and agi debuff when hit
35 - Turgur's spirit sight - see beyond the realm of the living and use the eyes of the spirit realm
37 - Suppuration - Poison DoT + sta debuff
38 - Atrophy - Slow + str and sta debuff
38 - Fulginous Coil - disease DoT + Slow
39 - Watery horror - Water breathing + disease DoT if hit
39 - Primordial terror - Fear + roots when it wears off
40 - Turgur's instant relief - Temporarily forces another person to be sick
40 - Malefic Shroud - Ward + Disease DD for the attacker that heals the target for the same amount
40 - Bane of shielding - Debuff that can ward the hit member and do disease DD damage when target attacks
41 - Eerie Aevenger - Buff that prevents death. Summons a shadow to attack the attacker
41 - Devitalizing Chant - AoE hate reducer, power drain
42 - Mail of Souls - Hate reducer + disease DD + heal
42 - Carrion shield - Ward + Disease DD for the attacker that heals the target for the same amount
43 - Fetid Balm - Instant heal + DoT proc
43 - Crystallize soul - Places a soul essence used to heal in the inventory when target dies
44 - Aphotic Corruption - Disease DoT and noxious debuff
44 - Harbinger - HP, power and defensive buff
44 - Ruinous Imprecation - Disease DD + arcane and noxious debuff
45 - Form of the spirit Hawk - turns the caster into an illusory image
45 - Baleful Efflux - Group HP buff + poison ward
45 - Dread Invective - Buff that drains power over time and does a disease DoT to attacker
46 - Voracity - Group str and sta buff - can decrease offense of enemies when hit
46 - Sacrifical Allevation - Instant heals that costs health to the caster
47 - Ghastly Shroud - Group Str, AC buff - can cause disease damage to the attacker that is convered into a heal
47 - Loathsome Seal - Str, Sta, agi, defense debuff
48 - Malefic Countenance - Wraith form
49 - Abhorrence - Int, Wis and Str debuff
49 - Tendrils of Terror - Slow and agi debuff when group is hit
50 - Juka's smoldering essence - ?
50 - Maelstrom of Dismay - AoE DoT that gets converted into power/health. Power cost is periodical and the caster is immobilized

I did not write this information. I do not claim to be the source of such information.