Spider venom ability

[GlitzFan]

""Spider Venom: If the unmodified hit roll for an attack made with this model’s Monstrous Fangs is 6, that attack inflicts D3 mortal wounds on the target and the attack sequence ends (do not make a wound or save roll).""

Monstrous Fangs has 4 attacks. If i roll one 6 - I understand i roll D3 mortal wounds. And say the other 3 dice are 5. Do I then continue with those 3 other hits as per normal or just stop?

[EMMachine]

You look for every role seperatly, so you roll the other 3 dice, and if you would roll 4 times 6 you would make 4d3 mortals wounds

[sorokyl]

In your example, you proceed to make 3 wound rolls.  "Attack sequence ends" only applies to 1 attack. (you're rolling them all together for the sake of convenience, but you could, if you wanted, do them separately. You would need to do this for instance if you split the attacks among targets) 
 

[King Taloren]

The rules are actually written that you roll every attack dice individually and settle each one before moving to the next dice. 

So one 6 is d3 mortals and the other three that are 5s are now to wound rolls.

Most people  tend to fastroll instead which is rolling all dice at once.  So just treat each dice as an individual attack that has no bearing on any other dice rolled for this attack sequence.