Elf Sippli y u so vague???

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So I'm in the fen caves (hollow tree in wicked fen) and I found the diary page. I left the expansion until I found poison touch (because elf Sippli said it would be useful to "get farther") I now have poison touch but I have no clue how I'm supposed to use it. I've kinda just been throwing the spell around in random directions. Any advice?