Question about skull mask

So yea, i saw today that the deer with this mask used mask spell on other and this other deer get the skull mask, i saw this a long time ago too, but how?
I thought that this way it wouldn't be possible to get this mask, until halloween
Mary13's picture

It's not possible to get the

It's not possible to get the skull mask legally before Halloween.

Unless you saw someone cheating with spelldata/hacking the game.
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