Rahi Beasts was a collection of tablets prepared by the Rahaga which detailed various Rahi wildlife in Metru Nui. The Order of Mata Nui included this collection of tablets under this title in their library. The Order's location guidebook instructed Order members to use Rahi Beasts as the reference to Rahi wildlife on the island of Mata Nui.
The Rahaga carved these records into stone during the Visorak invasion of Metru Nui. They intended for this guide to instruct others how to live better with the Rahi they described, or, if they failed to protect those Rahi from the Visorak, to serve at least as a final record of those creatures.