Artifact loot

What is the “item level” of artifact loot you find? Is it purely tied to your mage’s level, or does finding artifacts on a deeper realm level boost the stats of it somewhat? If they don’t, I think it would be a cool boost and make looking for artifacts a bit more exciting; it doesn’t need to be massive (like if it was equal to how many levels the realm gave creatures, that’d be a bit silly), but a slightly increasing boost per realm level would be interesting. Something like equal at 1, +10 levels at 10, +25 levels at 20, and by something like 300 it’d be +1000 levels or so (which really isn’t much at realm 300, I heard they were about +25000 levels by then!)