To this category I am counting Demon's Souls, Dark Souls 1 + 2 + 3 and Bloodborne. What is similar to them? Player controls main character (protagonist) with following camera. It is situated in world full of monsters and bosses. From them, you can collect souls/blood from killed enemies which you use for level-up your statistics or as currency for trading. What makes it fun to play? It's difficulty. It is challenge for players but is fair because enemies act by rules which players can learn. Also level design is important part. The feeling of real world, rewards for exploring it and placement of enemies. Important role is fighting. Players have large range of weapons to use - fast, strong, durable, combo, magic... And we cannot forget Fashion Souls which are players wearing different
armors.