Beregale

While not a classical "hothouse" world like venus, Beregalae is scarcely more hospitable. In addition to being closest to the star Tasale, its core contains many radioactives and other heavy elements. These increase the heat of the plants and drive volcanism.

Beregale's crust is too rigid for plate tectonics to function, and the planet will go through cycles in which the pressure builds to a massive super volcanic eruption. These spew ejecta over thousands of kilometers, leave caldera a few hundred kilometers across, and spew enough molten material to repave entire continents. The last such event was 812,000 years ago; the current rate of outgassing from volcanic hotspots suggests another will occur within the next ten millennia.