I find very odd that rook have so few skills, i mean, he can get almost all his shills without counting of course his stat skills, so what skills do you think rook should have? it could be for balance if you belice rook is not balanced for diversity if you thin rook is too "simple minded" or just for the hell of it. Well what the hell forget about rook, just do any demigod you feel like

Lets use this format to keep things organized: 

Demigod Name:
Skill Name:
Levels:
Flavor: *
Visual Effect: *
Effect:
Mana Cost: +
Casting Time: +
Cooldown: +
Replaces: -

* Optional
- If it replaces an existing skill
+ If not passive 

Example (Passive, without tags):

-Rook
-Rock Hardening
-4
-Rook hardens the rock he is made of to a point near diamond but thanks to this material being harder its more dificult to  reconstruct
-Rook Becomes Darker as you select levels.
-Rook gains 300/450/600/800 armor and 200/300/400/500 Health and looses  6/12/18/24 health per second

Or in case of an Active:

Demigod Name: Rook
Skill Name: Boulder of Ultimate Doom (Because meteor is too cheesy)
Levels: 1
Flavor: Rook Uses his Godly powers to bring forth a meteor from space and hit his enemies (Can only be used after he becomes  a God)
Visual Effect: a boulder of ultimate doom falling from the sky.
Effect: Hits the enemy for 999999999 + 1000000 for each point health you have.
Mana Cost: 100
Casting Time: instant
Cooldown: 0
Replaces: All other skills

Well guys as you saw in the examples it can be a joke or a serious suggestion although this is a "just for fun" thread

SO post.