Assasin adventures. The strongest weakling

500 years ago portals appeared and soon monsters came flooding out, soon humanity was in a panic until soon they awakened to there own powers from touching a strange black or large smooth marble. Once they touched it they had unlocked three unique things: there class, there weapon, and three starting skills. With these they had defeated the monsters and managed to keep the portals under control, leading to the birth of the W.A.S(world adventurer society) and the black marble rocks where named the “Stone of awakened power” and are used in the facility’s for newly awakened adventurers. You touched it and you got the class of assasin, which is seen as a terrible class but let’s see how you use it.