Not as deadly as snake's toxin, a spider's bite can nonetheless create significant problems if left untreated. Most spiders are so small that their bites are harmless, but some larger or deadlier varieties are able to kill children and even grown men.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
Spider VenomURL Copied!
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Ability20 points
A model wounded (after saves) by spider venom must pass a Toughness at the start of their turns for the rest of the game, or lose 1 Wound with no saves allowed.