Hero Idea: Rician the Zau

Rician the Zau

Lore:
In a far off landmass, unknown to all of the world, there exists an academy for the greatest of all the sorcerers of the land. One of these such sorcerers was a child named Rician. He was a bright student, quickly mastering any spells that was presented before him. But one day, while studying in the library he stumbled upon one dusty old tome labeled "The Grand Zau." Curious, Rician opened the book and read through each of the the dusty pages. In these pages he learned of the 'Words of Power,' words that had the ability to alter space and time itself. Reading the book, Rician decided that these Words of Power were stronger than anything the academy could have hoped to teach. Because of this, he stripped himself of his sorcerer's robes and became a Zau, one who uses the Words of Power, instead. Rician left the academy that day, tome in hand, to venture out into the world. Eventually he reached the continent where there was much war and strife. It is unknown why he chose to fight for the Dire in the Great War. Perhaps because he wanted more power and would seize it by force. Perhaps because he sympathized with the other strange creatures in this new world. Or perhaps there is a deeper meaning, that can only be understood by the Zau...

Attributes
Dire Ranged Intelligence Hero
Strength: 14 + 1.5
Agility: 15 + 1.8
Intelligence: 28 + 3.7

Skills

Q
Saut
The Word of Power 'Saut' is used by many Zaus in order to quickly cover large distances of land.
Using this skill will multiply Rician's movement speed by a certain amount, regardless of the regular speed cap.
1.5/2.0/2.5/3.0 times movement speed
Cooldown: 25
Mana cost: 120/115/110/105

W
Heiz
The Word of Power 'Heiz' is used by the Zau in order to prevent his opponents from escaping by scorching them with a fireball.
Using this skill on an enemy hero will stun them and deal minor damage over time
Stun: 1.75
Damage per second: 20/30/40/50
Damage per second duration: 3
Cooldown: 10
Mana cost: 175

E
Macht
The Word of Power 'Macht' is used by Zau to prove their strength.
When Rician uses this skill on an enemy hero, the attributes of each hero are added together. Whoever has a higher number wins the Macht. The loser receives damage and a permanent loss to their primary attribute.
Damage: 100/125/150/175
Loss to primary attribute: 1/1/2/2
Cooldown: 25/24/23/22
Mana cost: 140

F
Audra
The Word of Power 'Audra' is used by only the strongest of the Zau. It summons a great thunderstorm over a large area.
Using this channeled skill will make it storm over an AoE. The storm slows, deals damage per second, and decreases vision while in it. The storm disappears once Rician stops channeling it.
AoE: 800/900/1000
Damage per second: 100/150/200
Slow: 20%
Vision lost: 100/150/200
Max channeled duration: 5/5.25/5.5
Cooldown: 200
Mana cost: 300/400/500

Aghanim's
Any ally in the storm, including Rician, is invisible.

Thanks for reading another one of my hero idea thingys. :D Please tell me what you think about Rician, whether he is overpower, underpowered, or is he right in that snug spot in between. Again thanks for reading! :3