Can a warrior be changed into bersaker ?
If yes,how

Beside of amor, alchemy stone and relict there is no chance to reroll beside of starting from the scratch. 

Another terrible move while destroying Warrior with the transformation into Gladiator. 

PvP is dead for Gladiator and the funny stuff is that we are talking about a PvP game. 

Yes after awakening will come every class will be able to change from ascension to awakening for free.