From publisher blurb:
The stalking hunters known as Water Beasts are found on many worlds. Often found in lakes rivers or streams, they defend their territory ferociously. These large creatures will stalk their prey for miles or ambush the unwary that stumble upon their domain.
The Adversaries series delivers monsters you can use in your Starfinder campaigns.
This booklet contains:
The Water Beast: CR 5 creature and CR 9 dire version of the creature, including full stat blocks.
Four monster knowledge blocks, each delivering new information at an increasing difficulty. Expanded ecology information about the Water Beasts.