what does that have to do with the venom? does that men there is a difference between the armour save for;
a scar-vet with a magic weapon and shield
a scar-vet with hand weapon and shield
a scar-vet with hand weapon, shield and venom of the fire fly

Geko

If you wield a magical weapon then you don't get the additional +1 to your Armour Save for using a mundane hand weapon and a shield. The venom grants you the magical attacks and lets you keep the additional +1 as you're still fighting with a mundane hand weapon.