Hello, i bought the tomb of annihilation book from dnd beyond.. but i checked that aaracroka monster is missing from encounters... Can you add that? This is a monster that had reference on the book.. but  its necessary other book to check the stats.

From the Introduction to Tomb of Annihilation:

Running the Adventure

To run this adventure, you need the D&D fifth edition core rulebooks (Player’s Handbook, Dungeon Master’s Guide, and Monster Manual).

Text that appears in a box like this is meant to be read aloud or paraphrased for the players when their characters first arrive at a location or under a specific circumstance, as described in the text.

The Monster Manual and Volo’s Guide to Monsters contain stat blocks for most of the creatures found in this adventure. You don’t need the latter reference to run Tomb of Annihilation, as all the necessary stat blocks from Volo’s Guide to Monsters are included with the new monsters in appendix D.

The aarakocra stat block can be found in the Monster Manual. If you don't want to purchase the entire book, you can purchase individual monsters for $1.99 each.

Sad .. i understand..

Using the app i didn't find the option to buy individual monsters