At the end of the second location, you'll meet a boss. In order to start fighting him, you have to solve the riddle. You will fight two golems. It's probably better to focus on one enemy. The golem on the right can speed its turns up, so you might want to make him the priority. After you kill it, get the other one. If you clearly see you won't be able to slow down the hits of both opponents, use the shield instead of attacking. It decreases damage from both blows.