Death Fester Wurm

You don't lose the game for having 0 life.
Death Fester Wurm gets -X/-X where X is
your life total.
Death Fester Wurm can't attack unless you
have 0 or less life.
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Riku Assured Melira that the monstrosity had
been dead for centuries, but Melira could have
sworn she saw it's eye move.