Thread: The value of Grails and are they worth Demonic Cores

OK I think i may have figured out the value of the Grail from the Store earned with the Demonic Cores. On the Japanese wiki there is a guide on how to optimize the R and SR Grail as well as SR weapons. This goes into some math and I'm not great at explaining, but here goes. VERY IMPORTANT: This is Skill lvls and not weapon lvls, upgrading your weapon lvls has no effect on your skill lvls. If you get a R grail it's optimal to upgrade it to Skill lvl 3. Heres why: It takes 1 R weapon to upgrade this grail to lvl 2 and 1 R weapon to upgrade to lvl 3. As you can see from the Table below, it takes a certain amount of "points" to upgrade which the game changes to a percentage chance. So if you upgrade your Rare grails to lvl 3 it is worth 20 X Skill lvl so the grail is worth 60 points where as the grail and the 2 R weapons would only be worth 40 (Grail 20 + weapon x 2= 10 x 2).

If you upgrade one more time it's worth the same cost. 20 *4 = 80 vs 20 *3 +20 = 80 So adding the 1 more skill lvl means nothing. For SR Weapons the optimal lvl is 4 (140 points) For SR grails lvl 5 is optimal (250 points). Note that these are optimal for certain lvls, if you are trying to upgrade an SR weapon you will never need an optimized SR Grail. Check the Table below to see what points you need. Points are what you need at that lvl so for lvl 1 you need 5 points unfortunately there is nothing worth so little currently so you have to use a 10 point rare weapon. To go to lvl 3 from 2 you need 10 or 1 R weapon, lvl 4 from 3 15 or 2 R weapon and so on.

Heres the data for how the weapons work for upgrades:
Lv R SR SSR
1 5 10 20
2 10 20 40
3 15 30 60
4 20 40 80
5 25 50 100
6 30 60 120
7 35 70 140
8 40 80 160
9 45 90 180
10 50 100 200
11 55 110 220
12 60 120 240
13 65 130 260
14 70 140 280
15 75 150 300
16 80 160 320
17 85 170 340
18 90 180 360
19 95 190 380
R = 10 × Skill level
SR = 35 × Skill level
SSR = 350 × Skill level
R Grail = 20 × Skill level
SR Grail = 50 × Skill level

The idea that the grail from the store is worth it, eh it's up to whether you value the grails. The other big question i have is if the Demonic cores save over. If they are like other materials in events they would only work for that event. If they do carry over then they would be better saved. For me though i will not bet on them carrying over and i will spend them, maybe save some just to see.
link to Japanese language wiki page i'm referencing
http://xn--hckqz0e9cygq471ahu9b.xn--...A6%A7#b64ed5f6

So for multiple reasons that have been brought to my attention don't use demonic cores for grails. Above info still valuable for maxing the benefit of your grails.