Originally posted by UltramegaOK:

How can u be griefed in a non PvP game?

public server basically, unless you have a ward, anyone can use your stuff, take your stuff, dismantle ur stuff, etc.
What seems to have happened is someone used the OP portal to get inside the base, broke the ward (which doesn't require pvp) and as said, took everything.
The devs have a LITERAL warning about possible griefing on public servers on the join a game listing.