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Cave Runes Exp and Average Cave Keys Required

1->2 = 5 exp required (average 3,5 keys for 1x full set)

2->3 = 10 exp required (average 7 keys for 1x full set)

3->4 = 20 exp required (average 14 keys for 1x full set)

4->5 = 40 exp required (average 28 keys for 1x full set)

5->6 = 80 exp required (average 55,6 keys for 1x full set)

6->7 = 160 exp required (average 111 keys for 1x full set)

7->8 = 320 exp required (average 222,5 keys for 1x full set)

8->9 = 640 exp required (average 445 keys for 1x full set)

9->10 = 1280 exp required (average 890 keys for 1x full set)

10->11 = 1920 exp required (average 1335 keys for 1x full set)

11->12 = 3360 exp required (average 2336 keys for 1x full set)

12->13 = 5880 exp required (average 4090 keys for 1x full set)

13->14 = 7840 exp required (average 5451,5 keys for 1x full set)

Total: 20,575 exp required (average 14989 keys for 1x full set)

full 12>13 = 20450 keys average

full 13>14 = 27255 keys average

full 12>14 on 1 ninja = 47705 keys average

fun fact:

full sets on all 4 ninjas lvl 1>14 runes = 299780 cave keys average