Grieving is as defined above, destroying something that was made by another player.
You MAY Tear up someones block if you are (For instance Grabbing someones Diamond/Gold/Iron block to use it).
You MAY Tear a 2x2 Hole in someones wall to get in.
You MAY Tear down someones house if it is, so to say, a threat, or ruining your game-play.(A Mod will need to clarify this with more detail.)
You MAY Remove blocks to find someones hidden chest as long as you replace it.
NO Fire whatsoever.
NO Tearing down a random house.
NO Grieving just for fun.
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http://kiwike.se/forum/showthread.php?ti...hp?tid=176
Read the yellow text.