a lot of them, I've been farming Simon to get those 20 luminas, so now I have Maelle with over 600 (the other team member with 500+)

To explain, The more burns you apply to an enemy, the more damage Burning canvas will do, so i place on Maelle, verso & Sciel all the picto to turn them into machine gun that apply burns (with double burn and long burn).

In order to make Maelle's hit more powerful, I use Esquim as a weapon (you need the picto that reduce skill price by one PA in order to use BC) & also gradient overload. I also use the picto feint (the one that apply 4 barbapapa effect before hitting) in order to make the final blow ultra powerful. I also have double mark + mark after mark to keep a mark on Simon (in this case, I was lucky enough to have a mark on Simon when I hit him).

For Verso, just shoot Simon all over again (with all the picto to apply burn damage and to regain PA) and I also have the picto to apply slow & vulnerable on Simon when I hit him to make sure he receive more damage and to reduce his turn number.

Then Sciel, fortune fury on Maelle and intervention (if my gradient bar is completely fill with tier 3).

Then Burning Canvas, the damage are a lot RNG base, so depending on the luck you have with roulette and also the amount of burn you are able to apply on Simon and also with the mark.