Xavius by Leaf

Tier 1:
D - Induced Paranoia: When an enemy afflicts you with crowd control, they're feared for 1.5 seconds and afflicted by Nightmares for that duration. 45 sec cooldown.
D - Shade Armor: You passively gain shields equal to 25% of all spell damage dealt, that last 4 seconds.
D - Nightmare Infusion: You gain 10 Armor for each enemy in a small radius near you.

Tier 2:
Q - Feed on the Weak: Dark Mark now instantly kills minions. Killing minions this way increases the counter on your Nightmares quest by 1.
E - Recurrence: Nightmare Bolt's cooldown is reduced by 4 seconds for each enemy hero hit by the main projectile.
W - Growing Agony: Your Satyr's Brand ticks now deal 5% of the target's maximum health as damage.
D - Unstable Nightmares: Whenever your Nightmares quest increases your damage done by 10%, it is further increased by 5%, but your maximum health is reduced by 5%.

Tier 3:
W - Vivid Brand: If the tether lasts its full duration, the target takes bonus medium damage and is rooted for 1.25 seconds.
W - Locked in a Nightmare: Satyr's Brand now lasts 2 more seconds.
E - Trailing Darkness: Nightmare Bolt creates a trail of darkness along its path, which slows enemies by 25% and increases your movement speed and damage dealt by 15%. The trail lasts 4 seconds.
D - Festering Rip: Whenever you cast an ability, your next basic attack within 3.5 seconds deals splash damage in a small radius and applies Nightmares.

Tier 4:
R1 - Rift Warp
R2 - Crushing Shadows

Tier 5:
Q - Blackening Soul: Dark Mark creates a large area that reduces healing received by 75%. The area lasts 5 seconds. This effect cannot trigger more than once in 2 seconds.
E - Nightmare Flurry: Nightmare Bolt hits up to 2 heroes.
D - Lucid Dreamer: Your basic abilities' range is increased by 33%.

Tier 6:
Q - Cycling Darkness: If Dark Mark hits at least one enemy hero, its cooldown is reset.
W - Grasp of the Satyr: Your basic attacks on your tethered target deal 250% increased damage.
1 - Dream Eater: Activate to deal 10% of the target's health and heal yourself for 200% of the damage dealt. The damage done by this is doubled if the target is stunned and afflicted by Nightmares. 60 sec cooldown.

Tier 7:
R1 - Echoing Rift: Rift Warp now echoes a large pulse around you, slowing enemies by 70% for 2 seconds.
R2 - Apocalyptic Empowerment: Crushing Shadows increases your damage done by 3% for 10 seconds for each enemy hit.
D - Never-Ending Nightmare: Nightmares last 1.5 more seconds. Each second Nightmares is active reduces the target's Armor by 2, up to 30.
2 - Nightmare Blades: Activate to send fast blades in a straight line that deal high damage and ignore Armor. 10 sec cooldown.