Spiderfang "Totem of the Spider God" + "Venom of the Spider god"

[Ganigumo]

do these two abilities stack? My initial read was that they didn't, because its an ability that triggers on 6's and only 1 thing can trigger off of that roll, and generally buff stacking doesn't really work anymore, but reading a bit closer if they didn't stack, because its multiple abilities triggering on a 6, the ability wouldn't work at all.

Spider Venom:
 

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If the unmodified hit roll for an attack made with this unit’s Monstrous Fangs is 6, that attack causes 3 mortal wounds to the target and the attack sequence ends (do not make a wound roll or save roll).

Totem of the Spider God:

 

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While other friendly SPIDERFANG units are wholly within 12" of the bearer, add 1 to the number of mortal wounds caused by the Spider Venom ability of those units if the unmodified hit roll was 6.

Designer’s Note: If a unit is affected by the Light of the Bad Moon, this artefact of power does not affect unmodified hit rolls of 5; it only affects unmodified hit rolls of 6.

 

Venom of the Spider God:
 

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Venom of the Spider God is a spell that has a casting value of 6 and a range of 18". If successfully cast, pick 1 friendly Spiderfang unit wholly within range and visible to the caster. Until the start of your next hero phase, add 1 to the number of mortal wounds caused by the ‘Spider Venom’ ability of that unit if the unmodified hit roll was 6. If the casting roll was 10 or more, pick up to D3 different friendly Spiderfang units instead of 1.

Designer’s Note: If a unit is affected by the Light of the Bad Moon, this spell does not affect unmodified hit rolls of 5; it only affects unmodified hit rolls of 6.

 

[NinthMusketeer]

Yes they stack. Neither of these would be considered 'trigger' abilities themselves; instead they both modify a triggered ability. It remains only the Spider Venom ability that triggers on a 6.