Castle of Sand

Castle of Sand is a common tol'vir artifact. It requires 45 Tol'vir Archaeology Fragments to solve. Up to two Tol'vir Hieroglyphic keystones may be used to aid in solving this artifact.

Description
This is a small square fortress made of sand. The square towers and sun motif suggest tol'vir architecture, but you haven't seen this exact floor plan anywhere in Uldum. The object is clearly made of sand, not sandstone, so you're unsure what holds it together.