Beckylunatic shared a useful Reddit post today that’s worth promoting, because it explains the fastest way to your Mythic Artifact.
Now here is the breakdown for 1 mythic:
4 level 59 feeders
2 blank artifacts
All marks to upgrade
2 epics and 6 blues
600k base refinement to create feeders
You take the feeders and place two of each into the blank artifacts and upgrade them to epic, depending on crits this will land you around 91-94, now once you’ve made two of these during 2x you’ll see they are worth a whopping 5m rp each, now combine these into your mythic target artifact and boom, you’ve just made a maxed out artifact. 10m rp is much easier to obtain when its done the proper way. I will add that I recommend feeding everything about 10-15 runes short of what it may need to give yourself some wiggle room for crits. This is especially true when refining the target artifact to mythic because if one lvl 94 feeder crits it could finish your whole artifact in one shot.
This link has a table that will help you with rp values, use the colum on the far right and multiply it by 10.Indyre
It’s tagged as Xbox but is true for the PC version as well. It a really nice system to simplify the math behind getting your Mythic Artifact from scratch. One of our first Bag of Tricks covered feeding Artifacts as well, but the spreadsheet I created back then admittedly doesn’t cover multi-layer feeding and is way more complicated.