I've buried mine a couple of times, but it only had a reaction at Thorntrail. Nothing happened at Mothgarden. Haven't tried it near the other houses yet, but maybe we should just to be thorough.
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Plus, I put it in the fountain in the Motharden maze and it went ballistic.
Re: ROCK BUGS
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Plus, I put it in the fountain in the Motharden maze and it went ballistic.