Over on the Level Up site, I’ve written previews of some of the most complex and high-level monsters in the Monstrous Menagerie: spellcasters (including the lich!) and dragons.
From Spellcasting Monsters in Level Up:
One of our goals with the Level Up: Advanced 5th Edition Monstrous Menagerie was to make enemy spellcasters less of a pain to run. With an updated stat block format, we’ve made it possible to run a complex battle without looking up spells in another book or online resource–-all while working as expected with existing spells and features like counterspell and antimagic field.
From Dragons in Level Up:
The Level Up: Advanced 5e Monstrous Menagerie has dragons–-lots of dragons. With 85 pages of true dragons (about 90 stat blocks and variants) and 15 more pages of dragon turtles, sea serpents, and so on, we have a full source book’s worth of draconic friends and foes.
Along with the usual chromatic and metallic dragons, we have gem dragons (sapphire, amethyst, and emerald dragons) and a new category of dragons, essence dragons (earth, river, and shadow dragons).
Check out these two blog posts for lots of details and stat blocks! And then head to the Level Up kickstarter, where there are 3 days left. (I really want to get to $750,000, which is the level where I write a jabberwock as a stretch goal!)