Desril |
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1:
WotR Chapter 1:
All the ones *except* for the one in Kenabres do. The Kenabres one is damaged to a non-functional state in the opening of WotR leaving a "hole" in the Wardstone Barrier. The other stones remain functional for a day or 3. At the end of chapter 1 of WotR when the PCs destroy the Wardstone fragment and become Mythic, *all* the Wardstones lose their power and the barrier vanishes entirely.
2: No, they're artifacts, variant artifacts are extremely rarely published. You could make your own for a game, but otherwise you're out of luck.
3: Depends. Have you read their effects? If you keep them close enough together they make a barrier, if they aren't close enough it's just a large Forbidden radius, not a barrier. Aside from that the issue is that they're *giant stones* and would be extremely difficult to move.