Notes: Machina is EX+3LB with his LD, bloom passives, enhancement boards, and the following spheres - his and Gabranth's RF sphere. Rem is EX+3LB with her bloom passive and WoI. Vaan is EX+3LB with his LD.
Wave 1: Humbaba x2 (completed on turn 19)
Wave 2: Marilith Tempest x2 (completed on turn 63)
Score: 1004k
The strategy for the team comp that I used for the challenge quest is much easier compared to the original run. Just get Machina to use his LD and attack like crazy. Avoid breaks since the Marilith and Humbaba can gain lots of BRV or delay your character a lot if that happens. Make use of Rem's turn swap to get into a favourable position. You can keep on swapping turns with Machina and see him shave like a boss.
For Vaan, you can just have him just spam his skills like no tomorrow. Use his Red Spiral if he is targeted. Save his LD until he is left with 1 skill for each of his 2 abilities (or + variant). I believe it is possible to do with Vaan just EX+3LB with you have fully build Machina.
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