i think this gives a glimpse into my weird thought processes and interests.

i started out doing a glowing jackal for the whole jackallantern pun, but i decided fairly quickly the concept was best dumped in my box of ideas, so i put it to oine side and started work on a kangaroo who lives in the darkness instead. Why would a world with life be dark? Well, not all rogue planets start off floating in the night, suns pass other suns in the swirling chaos of a galaxy, so what if a world with sentient life was dragged off into the void by a smaller sun skimming through/, a brown dwarf, even? The results would be fairly apocalyptic, with everything freezing, any life that couldn't escape into bunkers underground dying an icy death as the water froze, all plants died and then the atmosphere fell like snow. So eventually the planesettles into a stable orbit in the habitable zone of the brown dwarf, baked in the invisible infra-red light, enough to restore the atmosphere and melt much of the water, leaving a world with a cold sun hanging in the sky, so close it appears like a baseball held at arms length, all day and night. it's too cold and dark for plants, but there's a feast for the fungii beneath the permafrost, and without insects the fungii grew big and started to generate their own light to fill the twilight of the new world the people in the bunkers below emerged to, altered in their wn ways after centuries of experimentation underground.

After mass extinctions, fungii generally are the first things to flourish on the world as the dust settles.