Earth

A group of humans long ago murdered Queen Deja and destroyed the city of Harmony.  This - and the war it sparked - have not been forgotten by Dextroluma.  However, to humans, something that happened two centuries ago is practically ancient history!  Many dextroluma associate the war with all humankind, while humans typically believe it was a specific radical group of that era.

Earth is a terrestrial planet with a variety of diverse biomes.  While it is rare to see Dextroluma there, it is not unheard of - many Dextroluma scientists are fascinated by how Earth's biomes intermingle, and how they cross the planet rather than being confined to certain parts of it.  Most Dextroluma, save for those from the Abyss, do find the planet to be a bit difficult to adjust to, due to its gravity being significantly stronger than that of Aerius, and it can be a bit difficult to reach mushroom supplies.  That said, the soil of Earth does tend to grow Aerius mushrooms rather well, so it isn't impossible for a Dextroluma to propagate some of their own for themselves if they need to - and an enterprising one might even be able to set up a business with that, as humans tend to quite enjoy the taste of Aerius' mushrooms as well!