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Message: <blockquote data-quote="Michael Linke" data-source="post: 8171901" data-attributes="member: 6873682">Not relevant to OSR, butThis may have been borrowed from the recent Warhammer miniatures rulesets that were in play at the time.  In 40k and AoS, there's a hard rule that you can only re-roll a roll once.  The fastest way to make a bonus (or penalty) that can't stack is to make it a re-roll.  +1s/-1s are generally stackable and adding in a few sneaky "doesn't stack" bonuses would increase confusion.  When a rule gives a bonus that can't stack, it gives a reroll instead.  Since the publication of WFRP 4e, the bonus and re-roll rules have changed yet again in 40k 9th edition, and will probably follow suit when AoS gets updated, so the rule will then no longer match what happens in the strategy game.</blockquote>