Consider your ramblings asked for.
As you wish.....
*****
Pulled up the Lemish trade data - A79568C-C Ag Ni Cp and your notes
An ‘Ag’ world with a dense atmosphere and a taint. And with chocolate plants as well.
Primary Star: M1V, the companion M2 is a bit far away to make a difference so I’ll ignore it.
Planet is a GG (Jupe size) with Lemish in orbit around it.
M stars are flare happy when young, so well make the star an old one. This also means it rotates slower around its axis. IIRC I read anything longer than a month is a nice boring star as the magnetic fields don’t entangle so much.
GG orbits star at 0.2 au (30Mkms). Jupe size/mass planet. M1V = 50% solar mass
So GG orbits star ~ 46. days
Lemish orbits GG at 21 hours or so.
Stellar effects:
Okay, the GG rotates its magnetic field interacts with the massive sun creating ‘magnetic tornados’ (severely twisted field magnetic lines) on the solar surface (similar to the storms on Jupiter from Io). These are normally small and inconsequential as the planet moves on fairly quickly and the star is passive – though there are disturbances as the GG moves across the face of the star (like a wake). However if the magnetic tornado hits an existing sunspot the field lines of the sunspot and planet snap back and you get a small flare (about the size of the GG). These are easy deflected by the GGs magnetosphere.
Now if you have Lemish in the right spot (aka between the sun and the GG, its own magnetic field enhances the effect and you get a bigger ‘snap’. A portion of the flare can leak through the protective magnetosphere via a magnetic flux tunnel, creating spectacular auroras, an enhanced energy input (maybe even some UV), and a slight problem with satellites. The dense atmosphere shields from most of the cosmic radiation associate with the flare.
And this enhanced energy input has a booting effect on local flora. How often/long this happens is your choice.
Planet Ag Rating:
The reason it’s an Ag planet so close to the star is a side effect of the moon the next obit in to the GG. Similar to Io it expels vast amounts or organic/inorganic materials in volcanic events. Due to vagarities of its orbit, gravity and magnetic this mater quietly rains down as space dust onto Lemish. Over the millennia this accumulation of volcanic material turned into very rich proto-soil. (Volcanic ash can be an excellent plant nutrient). Material still slowly rains down on Lemish so there is no immediate danger of soil depletion. This light rain of volcanic dust ocassionally comes in a 'clumps'. Not solid but a thick enough dust to have an effect on people respitatory systems (and hence the taint)
Flora:
The flora is based on chlorophyll D and F (‘red’ chlorophyll). Some terran plants have been geneered to work in this environment, but others haven’t. The Coca plant didn’t, so after experimentation they grafted the Caco pods to a local plant. This worked and had an unusual side effect – the plant produced caffeine like analogues (to fend off the local herbivores) and this input boosted the ‘flavour’ of the Caco. Hence a stronger flavored chocolate. During flares the native tree goes into overdrive (the enhanced light triggers rapid growth) and the resulting saturation of the Caco pods results in extremely yummy chocolate.
But now the dangers...
Fauna:
Lurking in the chocolate forests are creatures who you don’t want to meet. Amphibious in nature, they have a symbiotic relationship with a form of heat based cyanobacteria (blue green algae) they store in internal pouches. Their skins are a dark brown colour to better absorb heat, and excess heat not used by the bacteria is vented by their hosts breathing. About the size of a small cat people call them ‘frogs’ due to their flabby appearance and croaking vocalizations.
Normally they are quite passive, feeding on the local tree, which is processed by the algae in their interior with the resultant products providing nutrients to the ‘frog’. However when humans started grafting Caco to the trees problem happened. The theobromine compounds react badly with the cynanobacteria, and the compounds increase the aggressiveness significantly, in addition to providing a stimulant function in some ways close to a weak combat drug. These effects are enhanced during a flare event. The frogs are often harvested for this pharmaceutical quality, and ‘frog juice’ is a common narcotic. A cut open 'frog' leaks the greenish goo from its interior.
Whilst the ‘frog’ can’t hurt a human directly, the cynaobacteria in its system and on its skin cause a toxic effect in mammals. The effect hyper stimulates nerves, causing rictus and seizures. It is severe and death is usually the result. Post mortem, the victims muscles lock in place, giving them a horrified expression made only the more macabre with the ‘frogs’ nibbling on them.
What do these horrible creatures look like…?
Lemish Frogs
So sue me

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The day was almost over and I was bored. Luckily I didn't mention the
forest bears