Craft Essence Leveling

Pretty much that, make CE bomb so you can save QP

There's no way to make it faster or anything, but making CE bombs will save you a bit of QP.

What's a CE bomb and why to use them?

It costs 16,665,000 xp to level a 5* MLB CE to level 100. The amount of QP it costs when adding XP to a CE depend on the rarity and level of the receiving CE, so max-leveling a 3*/4*/5* CE 1k XP or 3k XP at a time would cost an insane amount of QP. (In addition, you might have a bunch of CEs you'd like to burn *now* instead of when you find that CE you want to level.)

XP is cumulative in CEs (*not* in servants). You can level a CE, and then use that CE as XP for another CE, with all of the XP you added to the first CE transferring to the second.

So, a CE bomb involves leveling up CEs whose only purpose in life will be as components to be added together later to level the *real* CE you care about in one fell swoop.

There are a couple of different methods, trading off QP-efficiency for time-efficiency:
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* Most QP-efficient version *

Step 1: Take a 1* CE that you have at least one dupe of. Add 16k xp worth of CEs + one more CE that's the highest rarity you're burning (to pack the most xp in before you hit the 16.5k cap) + at least one dupe of the 1* CE (to limit break it and increase the cap, so that nothing is wasted). This will generate a CE worth at least 21k xp.

Step 2: Repeat Step 1 nineteen more times, so you have 20x 21k+ xp CEs.

Step 3: MLB a 1* CE, and add all of the CEs you created in Steps 1-2 to it. This will generate a 425k+ xp CE.

Step 4: Repeat Steps 1-3 three more times, so you have 4x 425k+ xp CE.

Step 5: MLB another 1* CE, and add the four CEs you created in Step 4 to it. This will generate a 1.6M+ xp CE. (If you really like round numbers, go back and create a fifth CE bomb to add in with the 4x 425k+ xp CEs, with whatever total is needed to round things closer to 2M xp.)

It takes about 3.6M/8.54M/16.7M xp to max out a MLB 3/4/5* CE. Create another xp bomb as needed to fill in the gap over the 1.6M+ x N bombs, and then feed the gap-filler plus the necessary number of 1.6M+ bombs to level up your MLB 3/4/5* CE all at once.
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* Shorter version *

Using a fresh MLB 1* as your base each time saves some QP but adds a few steps, so the shorter version would be:

Step 1 as above, but make sure at least one of the 21k+ xp CEs is a MLB 1* CE
Step 2 as above
Step 3: Add all of the 21k+ xp CEs to the 21k+ xp CE that you MLB'ed (if you have multiple MLB'ed ones, choose the one with the lowest level)
Step 4 as above
Step 5: Of the four CEs you just created, feed three of them to whichever of the four has the lowest level.
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* Shortest version *

Adding xp to higher-rarity CEs costs more QP, but takes fewer steps:

Step 1: Feed 18k xp to a 2* CE. Repeat 5x.
Step 2: Feed the 5x 21k+ xp CEs to a 3* CE, making a 105k+ xp CE. Repeat until you have 20x 105k+ xp 3* CEs.
Step 3: Feed 20x 105k+ xp 3* CEs to a MLB 1* CE, making a 2M+ xp CE.