Mkay.. its me again, the Dota comparer 
I think the Rook is not that Op. As a few said before, you can dodge the boulder with a bit of training, it's even better, when you get some movementspeed. A bigger cooldown is also a good suggestion, since 5sec. of stun to more than 1 guy, if you hit well is pretty strong. I'd say use it like an "Ultimate" ability. Yes, these exist in Dota, and can only achieved at a higher hero lvl - such skill also exist here, which are also as powerful as those in dota, some are nearly the same. And these ultis - since the gamespeed is only a bit slower than Dota - got normaly CD above 30sec. Because in a teamup 5 sec. of stun can be enough to change a 5v5 => 5v3..
Frog, you say, why not make everyone more powerful.. Well, there is just one problem with that. A perfect balance will never be achieved, so where is the limit in powering up Demigods, whenever one is stronger than another? At the end, the whole game is just a 1 Stun + 1 Ability = Kill, so everything that counts is who can burst his combo faster... and then we''re on the way to Dota, which often is like that. And nobody wants that.
The Teleporting Scpeter is reeeeally cool. Again, there exist also an Item in Dota, called Kelen's Dagger of Escape which does the same. Also same cooldown but a little more range than here. BUT it wasn't a good items. Games on high lvl play were full of Daggers + they went nearly twice as long as normal games, because of crazy escape mechanism. Blink (short range teleport) is really powerful, and should be used with care. So, all Icefrog did, was nerfing the Port-Stick so it could only be used as an initiator. It still ports you, got the same Cd etc. but it gets disabled for 3sec. whenever you take a hit. Makes it impossible to escape with it, but its good for slow heros or tanks/demigods who need to initiate the fight.
PS: See, such a statement, like the one to the Artifact, can only be made by comparison to Dota. It was one of the bigger mistakes in the Dota-History, and Demigod does not have to do the same.
Edit: Abrahams shoul be more expensive imo. -25% cooldown is veeeery strong, he should cost also +10k. And they could add more damage items than only 3 (2 gloves and 1 ring right?). Didn't count the stats on artifacts 
So long,
Aspartem