Diablo – Does the damage of the “Gem of Efficacious Toxin” stack

Skills that state "% weapon damage" will deal the elemental damage from a weapon. Skills that state "% weapon damage as (element)" will not. So the weapon's fire damage would come through with Spectral Blade, but not with Magic Missile or Ray of Frost.

If the skill deals fire damage, either "naturally" or from a weapon effect, it should activate Conflagration.

Some sources here, here, here.

I tested every skill and the following attacks refresh Sweeping Wind. It should be noted that Sweeping Wind is refreshed when the skill is used instead of when the attack hits.

Normal Attacks

All Primary Skills

• Fists of Thunder
• Deadly Reach
• Crippling Wave
• Way of the Hundred Fists

All Secondary Skills

• Lashing Tail Kick
• Tempest Rush
• Wave of Light

Dashing Strike

Seven-Sided Strike

Finally, using Sweeping Wind again will refresh the timer and maintain any stacks.

Although Sweeping Wind's description specifies striking an enemy, it can both refresh and stack (via a crit) when one of the above attacks is used against a destructible piece of the environment. It can, however be difficult to reach the item you want to strike before Sweeping Wind itself destroys it. Thus, this effect can most easily be seen by using Dashing Strike to charge and hit an item.