How to delete most recent message in a channel

I don't understand the docs and I accidentally deleted the entire channel trying to figure this out and I still don't know how to do it. Please help

So far I have

var message = client.Messages.find(m => true);
client.Messages.deleteMessage(message);

But it doesn't delete the most recent message, it just deletes the first message since the bot came online and after that every time I try it it fails.

And I don't think it's specific to the channel