The second Invid Invasion
Hevea is the planet that the masters used to grow a specific type of rubber tree. The Hevea rubber is unique because it does not degrade over time thus it is extremely valuable for airlocks and seals on ships that have a long expectation of service. IE: The Zentraedi fleet. Due to unique qualities in the soil on Hevea it is the only world where this type of rubber tree can be grown.
There is no native intelligent species on the planet but the Perytonians have several large colonies on the planet. The colonies primary purpose is to grow crystals that their species use for various purposes. The crystal pools create large amounts of pollution so the planet’s atmosphere is thick with pollution.
There is an abandoned Tiresian city on the planet but it ran out of protoculture long ago and is mearly a ghost town. The Perytonian’s claim the empty city to be their property but they do not inhabit it.