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And I know everything and have found it all)). You need to visit the signposts in a specific sequence. The first signpost is near the Castle (I think everyone has found that one), the second is near the bridge (probably everyone found that too), the third in order is in the Dungeon not far from the transition (near some mine and an elemental recruitment structure), the fourth is near the Tree of Knowledge on the surface (next to the one-way portal leading back to the initial Castle), the fifth is near one of the Dungeon castles, and so on. The last signpost will indicate the location of Ashan's Tear.
P.S. I am sure about the first three signposts; the fourth should also be correct if the third says "Where they teach." I'm just not exactly sure if it is written specifically on the third signpost. And one more thing. You will need to approach the last signpost (the one that says where Ashan's Tear is hidden) twice: the first time before the penultimate signpost, and the second time, naturally, after it))). I could even tell you where Ashan's Tear is, but it would make things boring for you, so I won't do that.)))