Okay, I'll address your points and add a correction.
This plant is intended as a deadly magical defence - the main sub that uses it is still under work, but it is supposed to be deadly and difficult to circumvent.
Magical winds, very fine dust masks, poison immunities, etc, are valid defences. Heavy rainfall would mitigate the deadliness as well.
Also, I was deliberately vague on how much pollen would actually cause death so it is easy to allow for lesser effects.
As to effects of Cardiac arrest, it would be equal to a non-magical death spell :)
However, I did make a mistake on this sub, so some magical alteration of the standard Digitalis is needed:
From Textbook of Materia Medica, 5th edition, 1932, page 259
Since Digitalis is slowly absorbed, and excreted still more slowly, it does not cause acute poisonous symptoms.
To achieve the desired level of lethality in line with my intent on this submission, one should instead substitute Cyanide, a much more acutely deadly toxin and one which does occur in many plants. Though I took the easy way out, and just made the toxin a variant of Digitalis. Go to Comment
A magical plant (Fungi!!!) that powerful has to have an interesting origin! Perhaps a murder victim spoke some appropriate curse on their killer as they died, and the fungus which sprung forth betrayed the murderer to his own death? Maybe? :) Go to Comment
No, my thoughts on yours was just that it took a long time to charge. I've been starting the math to find out how much energy could be stored by nanotech flywheels using the physics equations, but have'nt really spent the time to sort it all out.
As for the steampunk aspect, I'm not sure - if it can contain enough energy to be explosive, it can be used as high yield fuel as well and drive gas turbines, etc.
This idea was based on accounts of large-scale flywheels used for energy storage, and what happened when the bearings got loose.
The other parts - hacking the system,etc, just struck me as hazards that would have to be delt with, and could add interest. Go to Comment
The PCs are invited to play in lumberjack games. They must see how quickly they can cut down a tree, how quickly they can use a great saw to cut a wheel from an already dropped tree, and must stay on top of a floating log while a lumberjack tries to roll the log to make them fall in the water. The winner gets beer and pancakes