This took a couple days. Figuring out how to position Eyjafjalla so that Mudrock could clear the bottom lane without needing Myrtle to block enemies took the most amount of time, but I finally came up with a strategy that didn't rely on RNG. The ending was a bit of a struggle (need to time Surtr's skill so that the correct operator will absorb the attack debuff) and Myrtle's skill timing could be improved, but it's not too bad if Surtr dies at the end of a wave anyway.
All skills are M3.
Timestamps:
0:00 0-100 enemies
3:38 101-200 enemies
7:09 201-299 enemies
10:41 300-349 enemies
12:37 350+ enemies
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