"Arena of Valor" (AoV) is a popular mobile multiplayer online battle arena (MOBA) game. BBBS likely refers to "Big Brother Big Sister," which could be a team name or guild in the game.

As for 西施 (Xi Shi), she is one of the Four Great Beauties of ancient China. In AoV, there is indeed a hero named Xi Shi, who is a Mage character. She has abilities related to water and beauty, fitting her historical persona.

If you're looking to use Xi Shi on your BBBS team in Arena of Valor, here are some tips:

1. Use her water-based abilities to control enemy movements.

2. Focus on positioning to maximize her area-of-effect damage.

3. Utilize her ultimate ability for team fights.

4. Work with your team to take advantage of her crowd control skills.

Remember that effective teamwork and communication are key to success in AoV, regardless of which heroes you choose to play.