You can’t miss them to progress the game, it’s the only mandatory boss from the start. There’s just lots and lots else you can do - I’ve tried him a few times and do okay until the third phase and I run out of magic, so I’m back to exploring, leveling up, and finding new gear.Seeing so many people talking about some boss called Margit early on and I guess I must have missed them cause I've played about 4 hours and have never seen them haha. Suppose that's the thing about open world games.
Just found the coolest place…
If you’re exploring the forest in the southeast and see a little building, make sure you go in and take the ride down.