EDIT: apparently the 47839 was a visual bug, the actual score was 48074 (as shown in the member participation status).
Of course the fatal before entry is 10s and during origin it's 2s YUP; I think I would've scored 49k if fatal persisted through the origin. I originally planned to use aura scythe and abyssal lightning before putting down the altars, but my timing isn't quite down yet.
You can check my stats in the preparation room (351m CP, 75k stat).
HEXA MATRIX
[ORIGIN 1] Crimson Pact 26
[MASTERY 1] HEXA Condemnation 29
[ENH 1] Aura Scythe 10
[ENH 2] Altar of Annihilation 10
[ENH 3] Grim Harvest 3
[ENH 4] Abyssal Lightning 10
[STAT NODE 1] (main) MATT 7 + (add) INT 7 + (add) CRIT DMG 6