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You strengthen cards by choosing a card to strengthen and then sacrificing up to eight cards which will be lost while the selected card is increased in level.  Each sacrificed card adds XP value which is then applied to the target card.  The XP value of the sacrificed card depends upon its rarity (# of stars), its level and its evolved generation. Strengthening is key to getting maximum value from cards and cards should be maxed out before evolving them.  The ratio of value increase is constant for every card.

If X is the level 1 card strength for a given card, then the following ratios appear to hold (with a tiny margin of rounding error).

  • Level 20: X * 1.57
  • Level 40: X * 2.33
  • Level 80: X * 3.45
  • Level 160: X * 4.93


The amount of XP and number of coins required for each level up increases.  Thus, strengthening from 1 to 20 is quite fast and requires ~160 XP while strengthening in the higher levels multiple sacrifice cards for a single level.

The amount of XP that a card will give when you sacrifice it, is its base XP (the amount it will give when it's level 1 - which depends on its rarity), plus 1/2 the XP you've put into that card. Thus if you've strengthened a 2-star card up to level 13 by sacrificing eight 1-star level 1 cards (80 XP), then that 2-star level 13 card can be sacrificed to give 80/2 + 14 = 54 XP to another card.

Base XP (to give)
Rarity XP
1-star 10
2-star 14
3-star 25
4-star 40

Rounded to the nearest coin, the number of coins required to strengthen a card is coins=20*\sqrt{Level}. This is the level of the card being strengthened, and is not dependent upon the card being sacrificed.

XP required to level
Level XP Formula
2 4 XP = \text{round} \left( \frac{1}{8} \cdot Lv^2 + 5 \cdot Lv - 7 \frac{1}{8} \right)
3 9
4 15
5 21
6 27
7 34
8 41
9 48
10 55
11 63
12 71
13 79
14 88 XP = \text{round} \left( \frac{1}{2} \cdot Lv^2 - 5 \frac{1}{2} \cdot Lv + 67 \right)
15 97
16 107
17 118
18 130
19 143
20 157
21 170 XP = \text{round} \left( \frac{1}{4} \cdot Lv^2 + 4 \cdot Lv - 24 \frac{1}{8} \right)
22 185
23 200
24 216
25 232
26 249
27 266
28 284
29 302
30 321
31 340
32 360
33 380
34 401
35 422
36 444
37 466
38 489
39 512
40 536
41 560
42 585
43 610
44 636
45 662
46 689
47 716
48 744
49 772
50 801
51 830
52 860
53 890
54 921
55 952
56 984
57 1016
58 1049
59 1082
60 1116
61 1150
62 1185
63 1220
64 1256
65 1292
66 1329
67 1366
68 1404
69 1442
70 1481
71 1520
72 1560
73 1600
74 1641
75 1682
76 1724
77 1766
78 1809
79 1852
80 1896

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