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Is it just me or does the nid venom cannon or the heavy venom cannon seem a waste of points. It's lack of ability to hurt tanks and only being AP 4 make this weapon seem like a waste of time, at least for me. So I was thinking of possible ways to keep with the fluff of the gun and making it a useful choice for it's points cost.

Venom cannon: poison 3+, assault blast
Heavy venom cannon: poison 2+ assault blast

special rule: If the center of the blast template is over a non vehicle unit it is considered as an attack from a power weapon.
A shot from a heavy venom cannon glances vehicle armor on a 4+

The only reason I would suggest poison is because it's crystallized venom and it would have no strength value against vehicles so they wouldn't need the silly -1 rule, just a glancing rule.

I just find it's very secondary to the strangle thorn, and with the impaler cannons and rapture cannons being available like you said, not a top choice. It is very much a bit out dated.