How to deal 2.3 billion damage easily with Maelle

SETUP: Turn 0: Sciel: Dies from "Auto Death" for "Clea's Death" + "Shielding Death" then revived from "Second Chance". Turn 1: Maelle: Free aim shot to apply burn stacks + charging gradient, then use "Last Chance". Turn 2: Maelle: same as turn 1: more burn and more gradient charge. Turn 3: Verso: Free aim shots until S rank (Sireso damage bonus), then base attack to apply "Greater Defenceless" and charge even more the gradient bar. Turn 4: Verso: Free aim shot to apply a Mark (double mark in our case) and then skip turn. Turn 5: Sciel: "Fortune's Fury" on Maelle to double her damage. Turn 6: Sciel: "Intervention" on Maelle so she plays again. Turn 7: Maelle: use "Burning Canvas" (or free aim shot to reach 100 burns, and try to apply a double mark again) If done correctly, this build is dealing about 2.3 billion damage without the enemy getting a single turn. If you're lucky, you can deal even more damage if "Stay Marked" activated. 50% chance to activate once and deal 50% more damage to the 3rd and 4th hits (about 2.55B damage). And 50% again (so 25% chance in total) to get a Mark on the 5th hit and deal about 3.25B damage. The weapon "Sireso" from Verso is bugged and is NOT working if verso dies from "Auto Death" at the beginning of the fight, or the effect is overwritten by (Greater) Powerful if the character in question is affected by this buff, that's why Maelle is not affect by any Powerful buff at all. It would have reduces damage up to 1.6B approximately (still enough to one shot any enemy, even in NG+5, in the case you're not using any health multiplier). Thanks for reading and watching.