Seems the summoned pet weapons are permanent, unlike the armor. I've had to resummon the armor for my arcamentals as expected but they still have their weapons when I log in not sure if as intended or a bug currently..
This weapon has a life stealing proc on it. The damage is around 19-20 base. Training dummy resisted 4 so the damage was 15. Heal was for 15. Damage type is curse and the proc name is called "Lichdrain".