From the back of the book:
What is a dungeon without deadly monsters? As the DM of an awesome 5th Edition game, it’s your job to ensure the players have formidable challenges that test their skill, creativity, and strength. To aid in this difficult task, the Total Party Kill Bestiary makes a triumphant return in its second volume to deliver a hoard of monsters from your players’ darkest nightmares. Hidden within is the greatest collection of high-level threats to appear in any 5th Edition product, guaranteed.
With each nefarious monster comes an arsenal of tools to help you run high-level encounters like a pro. Detailed tactics, colorful ecology, meaningful treasure, and researchable lore for each creature ensure a high-quality experience at the table. Unravel your party’s defenses with the strange magic of the hag giants. Reduce their worlds to ruin with the otherworldly power of the doomstars. Burn to ash all they hold dear with the infernal might of the hellfire lords.
Whatever your nefarious DMing needs, the Total Party Kill Bestiary: Volume 2 provides.