Your task in Blade.io is to get as many upgrades as possible and gain most points compared to the other players. Collect color orbs to gain experience and become the biggest giant in the arena. The higher level of players you kill the more points you get.
The more points you get, the more levels you upgrade, the bigger your character and weapon become, which means that you can attack a greater area. At the same time, even you were hit once, you will die immediately. Even newbie can kill you if you were not that careful. When you are small, use speed booster to dash and kill bigger enemies.