I'm big on making my own content for games I like, and I was musing over the following rule. Probably most useful on a Line unit, to hold an objective against a normally superior force.
Total Defense A unit with this rule may choose, at the start of any fight phase, to double their
WS for the duration of the phase. If they do so, their Attacks stat is set to 0 for the duration of the phase, and they may not benefit from any source of additional attacks.
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Edit: I should point out, I have no idea WHO would get this rule. But it's an idea!