Hint: Have you found the teleporter pyramids yet?
<span class='standouttext'>Spoiler : </span><span class='spoiler'> Use teleporter to first island. Drop pyramid. Use teleporter back to mainland. Teleporter on first island now points to second island. Use pyramid to get to first island, teleporter to get to second... </span>
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Map to find pyramids:
http://beyond.divinedivinity.net/help/act2_forest_nw.htm 
