No the Giant spiders don't poison you, the only spiders in the
game which are capable of poisoning you are called "Poison
Spiders".
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Yes, Poison Ivy is a confirmed Character. She will definitly be
in the game. Just go to Google and type in LEGO Batman then click
wikipedia then scroll down she is going to be in the confirmed
characters.
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Summer Catch
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Upas (also called ipoh) is an arrow poison used by people of
Indonesia and Malaysia.