Poisons must be used from a main inventory slot, not inside a bag. And you just right click them to use. Though, I am not sure if apply poison works properly yet or not. I know some work on poisons was done a while ago, but I haven't really tested them for a long time.
And for learning a tome, you can't just click on it to learn like a spell scroll or something. You have to turn it into your class GM, like the Berserker GM in PoK for example. When you turn it in, they will train you in it.
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