u/RichWalk9891

I've updated a guide provided by Atomos199 from GameFAQ to make it less complicated to understand.

Provided below is a table that will help you achieve every possible secret rewards after cleansing Malice in the Graveyard:

Enemies	0-2 Fusion LV	3-5 Fusion LV	6-8 Fusion LV	9-11 Fusion LV	12-14 Fusion LV	15-18 Fusion LV
1	2	2	3	3	4	5
2	4	5	6	7	8	10
3	6	7	9	10	12	15
4	8	10	12	14	16	20
5	10	12	15	17	20	25

Each enemy give Malice Points, and the amount varies depending on how many enemies are on screen and what your current Fusion LV is.

Here's how it works, starting with back to the beginning of the game:

• Two Wolves in the Plains while having Fusion LV 2, (having only Death Emperor and Raging Tiger), will yeild 4 points. This will reward you the Seal of Wisdom once you go to the Graveyard and cleanse your pendant of Malice.
• Fighting a Wolf and either two Vampire Bats/Venomous Spiders in the Plains, while still having only Death Emperor and Raging Tiger (totalling up to Fusion LV 2), will yeild 6 points.
• Once you have reached Fusion LV 3 after slaying enough Wolves to unlock the Tornado Soul, you will still yeild 4 points, as what Fusion LV you've upgraded to after the battle does not affect how much you've gained during the fight.
• If you then fight two Wolves again while at Fusion LV 3, you will then gain 5 points instead of 4 points.
• [EDIT]: I'm not 100% sure, but apparently bosses and mini-bosses do not yield Malice Points.

Provided below are the one-time rewards that can be obtained upon reaching a certain amount of points:

Reward	Points Needed
Seal of Wisdom	4
Key to Success	7
Seal of Vitality	25
Silver Hand	35
Kirin Scale	42
Seal of the Soul	50
Seal of Force	56
Seal of Speed	60
Seal of Strength	63
Seal of Life	70
Seventh Key	77
Seal of Aura	84
Monkey's Paw	91
Seal of Luck	98
Dice of Caesar	99

Bear in mind that once you reach a high enough Fusion LV, certain rewards will be permanently missable, with the exception of rewards needing points that are multiples of 5.

I managed to open 11 treasure chests in Omega Ruins, only for the last one to be trapped, missing out on the grand prize.

As much as I would like to keep trying, I'll just consider getting 11 out of 12 prizes as a win in my book. No sense in stressing myself out over missing out on x99 Warp Spheres when Teleport/Return/Friend Spheres are all easier to grind for.

But, bloody hell, kudos to anyone who were stubborn enough to get all 12 treasure chests in a row.