In a book I read 20 years ago, their were three creatures competing for an active ancient site. Through some weirdness, the three had the Rock Paper Scissors relationship. I'm sorry I don't remember the details, but I do remember how they interacted.

The lizard creature (not sure of its name) could kill the Hydro. Simply using its "Pincers" to snip it apart.
The Hydro (a gelatin water based creature that could send out blasts of water at almost any temperature) could kill the Windflower (sunflower creature). Simply blasting hot water at it's "Roots" and causing it to wilt.
The Sunflower Creature could kill the Lizard Creature by bending it's petals into a hard point and spinning it into a drill and cracking the scales off the lizard.

The Lizard had no fear of the Hydro. Its hot water blasts only bounced off the lizards hard scales.
The Hydro had no fear of the Windflower. If it tried to "Drill" the hydro, the jelly body just rolled off with no impact.
The Windflower had no fear of the Lizard, for it's drill bit head could split the Lizards scales apart in a second.

The story gets really complicated when each creature has another being implanted into their mind to help them with the challenge. (5 years and 2284 days ago)