Go for the easy XP while hiding in the corner

While you could try to hunt down adventurers yourself for the XP this is actually the first time you've ever actually had any and you're a bit afraid of what might happen if you die, would you lose it all?

The boss himself respawns in a couple seconds after the adventurer was dealt with, you can kind of tell the boss himself seems a bit tired of all of this as well, I mean he doesn't even have a name, he's just called "Kobold Chief."

Thinking about that you might be able to get a powerful ally if you can convince him, after all, you kobolds were designed to work as a unit.

So what you plan to do is wait in the boss chamber hiding in the shadows, ideally you'll hit the adventurer when the boss deals 25% of their HP so you can get the XP.

You hide in the shadows and it takes a while before the next adventurer shows up, this one by their appearance looks like a starter mage what with the blue robe the mages usually have.