Orc

import random

class Monster:

    def __init__(self, player_level, difficulty):
        self.hp = 9
        self.type = f"{random.choice(monster_detail)} {self.__class__.__name__}"

    @ staticmethod
    def spawn(player_lvl, difficulty):
        # Monster.__subclasses__(): get the list of Monster class's subclasses
        # random.choice(...): get one of the Monster subclasses
        # ...(): get an instance of the (sub)class

        return random.choice(
            Monster.__subclasses__()
        )(player_lvl, difficulty)

monster_detail = ["Alchemist", "Archer", "Assassin", "Berserker", "Cleric", "Druid", "Fighter", "Monk", "Paladin", "Ranger", "Rogue", "Sorcerer", "Warlock", "Wizard"]

Orc = Monster(1, "Easy")
Orc.hp = Orc.hp + 20
print(Orc.hp)