underrated weapon/strategem?

What’s your go-to underrated weapon/stratagem that’s way stronger than people give it credit for?

I’m not talking about the obvious meta picks — I mean the sleeper hits. The niche stuff that slaps hard if you actually know how to use it. Bonus points if you explain your use case and why it’s so slept on.

Like, what’s your personal "this thing is cracked but no one talks about it" pick?

I wanna see your secret sauce. Don’t gatekeep, drop the knowledge.