The Soul Devouring Lamp is a Level Five Divine Soul Immortal Artifact that relies entirely on the power of one's divine sense. Any cultivator from both the Immortal and Demon Realms would be able to use it. The extent of its effects depends entirely on the power of the one using it.
It is a strange-shaped glass lantern. There are four strange beasts on it. The four beasts look very similar in appearance, but there are actually slight differences. The one with the single horn on its head is called 'Greed', and it likes to capture living souls. The one with the sunken eyes is called 'Sealed Nether', and it likes to contain remnant souls. The one with the two closed ears is called 'Ignore', and it likes to seal the soul. The one with the fangs at the end likes to devour the soul. Each of them represents four abilities of that Soul-devouring Lamp.
None of these four beasts are good people. According to the reports, you're not allowed to follow any conventional methods when refining that thing. Otherwise, you could very well end up suffering a backlash from the spirits of the four beasts and end up suffering damage to your soul instead.