ShadowKnight
20 - Harm Touch - Instant Disease damage. 30 min refresh
21 - Graven Embrace - Feign Death other (or self). 5-min reuse timer, for combat usage to save someone.
21 - Sickening Decay (Supersedes 7 - Assault) - PBAoE Disease attack.
22 - Grim Coil - Disease DOT. Short duration, good damage. Similar to Blood line in EQ1.
22 - Decree of Decay (Supersedes 8 - Shout) - Encounter taunt and "curses all enemies with a lifetap shield". Effect of lifetap shield presently unknown.
23 - Unholy Order (Supersedes 9 - Call to Arms) - Increases offensive skills levels and DR for group.
24 - Tainted Caress - Lowers an opponent's Agility score, and on attack there is a chance you will capture a piece of the creatures soul as an essence item. This essence item is used in pet summons.
24 - Grim Harbringer (Supersedes 10 - Blessed Weapon) - Weapon proc abilitiy. Procs are Disease damage. Uses Concentration.
25 - Fetid Grasp (Supersedes 11 - Righteous Blow) - Disease melee damage.
26 - Tainted Sacrament - Summons a single pet for 30 seconds to attack an opponent. Similiar to EQ1 swarm pet. Uses one tainted essence (from 24 - Tainted Caress).
26 - Infernal Pact (Supersedes 12 - Demonstration of Faith) - Wards damage on groupmember and grants lifetap proc ability until ward is used up.
27 - Condeming Spirit (Supersedes 13 - Righteous Anger) - Ranged Disease DD.
27 - Decripit Slam (Supersedes 13 - Unyielding Advance) - Shield required bash. Stuns and does Disease damage.
28 - Consume Vitae - Lifetap. Disease based damage.
28 - Cruel Intent (Supersedes 14 - Cry of Conviction) - PBAoE Disease damage instant, plus Slashing damage DOT.
29 - Painbringer (Supersedes 15 - Faithful Swing) - Swing-like attack that lowers enemy Strength.
29 - Sorrow (Supersedes 15 - Power Cleave) - Attack that requires two handed weapon.
30 - Draw Strength - Similiar to Siphon Strength in EQ1, taps enemy Strength and delivers it to self.
30 - Lucan's Pact (Supersedes 16 - Knight's Stance) - Lowers offensive skills, raises defensive skills, resistances, and gives undead form.
31 - Grant of Armament (Supersedes 17 - Offering of Armament) - Transfer armor class from the caster to the target for 2 minutes.
31 - Disease Cloud (Supersedes 17 - Inflame) - Taunt + small but very quick acting Disease DOT.
32 - Grim Sword - Melee based attack. Damage type is Disease. High damage & power cost. Good for burn.
32 - Evasive Manuevers (Supersedes 18 - Ancient Pledge) - Buff on others to give chance to block/parry blows meant for them. Raises parry skill.
33 - Spiked Boot (Supersedes 19 - Charge) - Piercing damage attack.
33 - Contract of Shadows - Strength, Stamina, and Agility buff. Self or groupmembers, uses 1 Concentration per target.
34 - Malefic Touch (Supersedes 20 - Harm Touch) - Instant Disease DD. 30 min reuse.
35 - Swarming Spirits (Supersedes 21 - Sickening Decay) - PBAoE Disease DD + Lifetap
36 - Vile Coil (Supersedes 22 - Grim Coil) - Disease DOT. Short duration, good damage. Similar to Blood line in EQ1.
37 - Insatiable Hunger (Supersedes 23 - Unholy Order) - Increases Offensive skills and grants lifetap proc to entire group.
38 - Cursed Caress (Supersedes 24 - Tainted Caress) - Lowers an opponent's Agility score, and on attack there is a chance you will capture a piece of the creatures soul as an essence item. This essence item is used in pet summons.
38 - Unholy Aura (Supersedes 24 - Grim Harbringer) - Weapon proc abilitiy. Procs are Disease damage. Uses Concentration.
39 - Baleful Smite (Supersedes 25 - Fetid Grasp) - Disease damage melee attack. If hits, launches extra small AE Disease damage.
40 - Dreadful Wrath - High damage Disease DD. Also slows movement of enemy, using 1 concentration while active.

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