Just bear this in mind. Once you use this on your opponent they will use it back.
Celephus can vouch for this as he used it with his sisters on me against my SW (After a minor hissy fit at such a rule even existing - I was positive he was making it up). I then used this rule against his seraphims leader within the squad.
So it works both ways. You need to way up the pro's and con's of unveiling these gem rules in certain games.
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