The boss is very fast, and if you aren't quick on your feet, and your head on a swivel, you could easily be killed. Mind you, killing the boss doesn't mean you are home free, in my early tests without food, you can die to withering after defeating the boss.
Good luck and enjoy this castle, it is a good one! :-)
PS. In terms of loot, I got just over 250 gold bits with a stone battle axe, no armor, and 16 steak. Of course after that I was fleeing for my life, but totally worth it! Haha!
PSS. Not going to go into details, but if you want a hard fight, no level set yet, but the slime at home tree is deadly as hell. With the same gear as above, I died in less than a minute and after about 10 fights I have only beat him once. Of course if I had arrows...
Final PSSS. New video coming out tonight showing the progress of home tree! Look for that here and on our Youtube channel! www.youtube.com/channel/UCLwD63c-RfTMQdV_XtwHHcw