Hi there,
apparently the spell to inflict poison upon all newly produced, living units doesn't work properly.
I observed this while playing as Dark Elves and with iamaseer on to see how many units are actually affected and it's only 25% percent - if at all (the level of the spell doesn't seem to affect the success rate, also worth mentioning I played against Ssrathi so they SHOULD get poisoned). So most of the time the spell doesn't work.
The spell to transform the poison into lethal poison on already affected units doesn't work properly either, even less than the above mentioned one.
~ Libra