Boris K
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If I remember correctly (it's been a while since I played this mission), the sawmill is located east of the castle. I don't remember the exact location of the obelisks. There are 3 of them in total. One is somewhere in the south, not far from the bridge. Another is somewhere in the northeast. The third is somewhere in the middle. You need to find them all. Then it will be clear where the Tear is. It can be in different places.