Guild Wars 2

Does the trait that increases the duration of applied venoms affect the stun duration on Basilisk Venom? And does a para sigil affect the duration as well?

Nope, the trait increases Poison duration.
Which is a seperate effect under the category of conditions.

Basilisk Venom, also has its own effect which isn’t counted as a stun,
for other than stun-breaking purposes.
So unlike daze and normal stuns, the sigil of paralyzation doesn’t extend it.

Residual venom trait increases the duration of basi venom because it basically lets you apply it twice.

But you have to remember to stagger the hits. You can’t just go pow pow. Kinda a pain if you’re running with auto-attack turned on.

Yep, the duration isn’t stacked so you have to wait a bit before applying the second strike if you want to optimize that trait. This is why Thieves Guild is much better for Venom Sharing builds than Basilisk Venom.

Lokheit.7943:

Yep, the duration isn’t stacked so you have to wait a bit before applying the second strike if you want to optimize that trait. This is why Thieves Guild is much better for Venom Sharing builds than Basilisk Venom.

I respectfully disagree. A thief running Basilisk Venom with a Venom Share build AND a coordinated team is basically unstoppable. If you manage to share Basilisk Venom with 4 teammates, you can each take a turn playing whack-a-mole.