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
While natural foxglove is toxic, the giant variety would have been specifically bred to enhance the toxicity of its pollen. As ingestion of 2 or 3 grams of regular foxglove can be lethal, a plant of this sort is not impossible, even in a real-world setting...
"I hope that you enjoy my little garden, Mr. Bond..."
Symptoms of foxglove poisoning include (flips textbook pages...) vomiting and digestive upset, blood pressure fluctuation, dialated pupils and the appearance of "halos" or "auras" around objects, leading up to convulsions and heart failure.
"Actually, there was Giant Foxglove toxin in both goblets. I have been building up a tolerance to it for some time now." (...Which doesn't really work with this sort of toxin.) Go to Comment
This orange colored lichen will when mixed with water and drunk put the user into a deep slumber for several hours and it also enables their body to resist cold damage from anything short of a full polar icestorm or the breath of an ice dragon.
It has several disadvantages howerver. It is very hard to wake up from under the influence of this, and also the user can wake up from it and then fall asleep again at random times for up to three days after taking it.
And if taken in a warm or hot climate the effects are deadly as the body rapidly heats up to the point that the victim rapidly dies if an antidote is not given. Go to Comment
A loveable skeleton ("No, it is a constructed lifeform!" corrects you the pretty female student) with amusing quirks and a big question mark following him - there's bound to be students and teachers that to figure him out now and then.
Like him from the spirit thing up to the bones rattling. :) Go to Comment
He doesn't have to be! How you use him is of course on you, but even a connection to the -jacks is not necessary a bad thing.
You can keep his uniqueness, and pronounce instead, that he is the original inspiration for the whole concept of -jacks. So a whole school of magic (and a very useful one, at it) was based on this creature. But no matter what the most skilled of wizards will try, they just can't create anything resembling Thom...
This is absolutely awesome; while I had a similar character turn up in a story once, this is by far the better production of it; Astrolith was nowhere near as interesting or as potentially complex as this fellow is. I could see him becoming a kind of strange sage over long periods of time, wandering across the world long after the civilization has fallen, helping people out in the dark times and perhaps a popular kind of figure in the civilizations that follow.
I'm picturing a sort of thing where a family of refugees are huddled in a small cave or stuck in a tree to escape some menace - an angry bear, an ogre, some bandits - when this skeleton looms from the darkness... Then smacks the troublemakers around, or casts some spells to drive them off, and accompanies the family to the nearest true settlement. With the youngsters, by the end of the trip, calling him something like 'Unca Skellington'. Go to Comment
It is just so darn odd that it is perfect. It is well explained (even while not really explaining anything). His back history and his odd abilities make him a wonderful color character for a magical academy. Go to Comment