Well the faction that had 4 land there had enough power to keep it, so there's massive TNT craters all around the base (which was destroyed).
The mushroom bio is still ok, albeit badly scarrred.
Also it has come to my attention (through czechrazor) that someone is griefing and leaving behind signs that say things like 'With love, Pompus' etc.
I want to make it clear that I do not grief active bases. Nor do I leave behind a sign telling someone it was me. If your power is low and I know where your base is I will go there on foot, claim your land and raid your chests. I then unclaim your land and leave without damaging a single block. Just like any good player would. I will not mindlessly destroy your base to satisfy my own bordem or lust for destruction, especially if your faction has enough power to hold their land. That's just low.