Trigger
Type: Custom
Event Type: Status
Check On...: Event(s)
Event(s): PLAYER_LOGIN, PLAYER_EQUIPMENT_CHANGED

Custom Trigger:
function()
    return IsEquippedItem("Turbulent Vial of Toxin");
end

Custom Untrigger:
function()
    return not IsEquippedItem("Turbulent Vial of Toxin");
end