What are the Solana killers?

Could you please elaborate on the mysterious concept of 'Solana killers'? What exactly are they, and why are they significant in the realm of cryptocurrency and finance? Could you provide some insights into their functions, their potential impact on the Solana ecosystem, and perhaps even offer some speculation on their motivations? It seems to be a topic of much buzz in the crypto community, and I'm eager to understand it better.