If your query refers to a "Graias" or "Gigas" (great) petra (rock/stone) initiation in a tribal context, you might be thinking of the tribe's ritual:
Don't get hit. Even a small scratch resets your combo meter. graias petra s painful initiation 1 2 better
The first initiation phase pits you against fast-moving infantry and elemental casters. If your query refers to a "Graias" or