Mordenkainen’s Tome of Foes pdf is that it contains over a hundred different monsters and so it is called the monster manual. The monsters go from low level to as high as challenge rating twenty-six. It has many high CR monsters that you will be able to use for your endgame or the top-tier campaigns.
They are named after demigods, archangels figures and you will find several of them that are high-rated characters.
Also, the demon lords make an appearance in the book. There are stats on these monsters too. You will also find several pages on scary monsters from hell. Here is also the mention of the classic undead like the nightwalker and the bone claw. Most of the monsters here have unique abilities and none of them are mundane.
The book discusses some extremely powerful elemental creatures also. You will find that stats blocks of several new and scary monsters are given in the book. It has backstories of various nonplayer characters that will help you build an all-rounded character. It has different types of tieflings depending upon the parent devil that you might have.