Deckard Cain by Zyver

Deckard's presence compels enemies to stay a while and listen, their movement and attack speed are reduced by 25% when in melee range of Deckard. Effect continues for 1 second after leaving melee range.

Deckard pulls out a book and starts reading whenever he is stationary. Gains 10 knowledge every second that he is stationary after waiting 2 seconds. Channeling, attacking, or receiving damage halts the gain of knowledge and resets the 2 second wait.

Deckard warmly greets all companions in range healing them for 10% of their max health, and a further 15% channeled over 3 seconds if they stay stationary. 

Knowledge cost of 10. 
Cooldown of 5 seconds.

Deckard examines the opponent's equipment to identify any weakness - Increases their damage taken from friendly heroes by 25% for 3 seconds.

Knowledge cost of 20.
Cooldown of 10 seconds. 
Cannot be used on the same hero twice in a row.

Deckard transmutes the gear of opponents to create a new item for a friendly hero -

Opponents:
5% permanent damage output reduction to all opponents in range of the targeted friendly hero. 
Damage reduction only expires on death of the effected opponent, or death of the friendly hero. 
Damage reduction can be stacked indefinitely, each stack is represented as a separate icon corresponding to the friendly hero that must be killed to remove the debuff.

Friendly hero:
5% permanent damage output increase to targeted friendly hero per opponent that was debuffed. 
Damage increase only expires on death of the effected opponent, or death of the friendly hero. 
Damage increase can be stacked indefinitely, each stack is represented as a separate icon corresponding to the opponent that will strip the buff on their death.

Knowledge cost of 50.
Cooldown of 15 seconds. 

Creates a portal that lasts 15 seconds. Portal allows any hero from either side that clicks it to travel to between the shrine and core on Deckard Cain's team's side. Can be cast again after 1 second cooldown to close the portal early. 

Knowledge cost of 75.
Cooldown of 45 seconds. 

Boosts a friendly hero's damage by 25% until their death. Can not be cast on the same hero again until that hero has died and lost the buff. 

Knowledge cost of 100.
Cooldown of 90 seconds.