VG247 has published a new interview with Dark Souls 3 director Hidetaka Miyazaki, in which he discusses the game's open world and harsh enemies.
“Everything is designed to kill you,” Miyazaki says, “The level design, as well as the enemy placements, everything has been arranged to kill you. But you can actually use those to your advantage as well.”
It's vital that you monitor enemy patterns and you'll need to separate enemies to have any chance. For example, going up against two Knights is an almost impossible task, as is taking on a Stone Dragon but you can lure enemies into the giant lizard's flaming breath, saving you a lot of effort in the process.
The producer playing the game during the demo left two Knights in a lower room and climbed up to a rooftop instead (you can go anywhere you can see), only to be destroyed by a black monster.