Revealing some more mobs! Two of them are bosses, the Hyper Weapon, and the Dissomorph.
The Hyper Weapon is an endgame boss that'll be very tough to take down (think of it as the final boss)
The Dissomorph is an evolved Ghoul - the final stage of Ghouls, if you will. They spawn in Ghoul hives, and they are early game bosses. Think of the Dissomorph as the first boss you'll fight in the game.
And the Shrieker Ghoul isn't a boss, but instead another type of Ghoul - it wanders around in the daytime, unlike other Ghouls (all the other Ghouls sleep in the day). If the Shrieker Ghoul spots you, it'll shriek, which'll wake up all surrounding sleeping Ghouls in the vicinity and aggravate them to attack you.