Development and updates on this website have come to an end. There won't be any more update in the foreseeable future.
More details here 
Final Device
While operating it for the first time, Ciel mastered the use of this wrench without a teacher. After that, Ciel used this wrench to complete the assembly of two sets of dynamic mecha and even repair many key parts in emergencies... To Ciel, this wrench is not an ordinary tool but an extension of her craftsmanship.
Solar Arrow Domain
Passive
Whenever a chain combo hits a target, it leaves a Solar Arrow Mine on a random tile within 1 surrounding cluster that triggers and explodes when an enemy passes over it, dealing DEF-ignoring damage equal to 30% of Ciel's ATK to 5 tiles in a cross shape. Solar Arrow Mines disappear after they explode or after the end of the round.
Level details
Level 1
Total bonus stats:
ATK: 30DEF: 10HP: 50Counter Bonus: 3%
100
Level 2
Total bonus stats:
ATK: 60DEF: 20HP: 100Counter Bonus: 7%
5
400
10000
Level 3
Total bonus stats:
ATK: 60DEF: 20HP: 100Counter Bonus: 7%
10
800
20000
Level 4
Total bonus stats:
ATK: 90DEF: 30HP: 200Counter Bonus: 11%
5
500
30000
Level 5
Total bonus stats:
ATK: 120DEF: 40HP: 300Counter Bonus: 15%
5
500
30000
Level 6
Total bonus stats:
ATK: 120DEF: 40HP: 300Counter Bonus: 15%
10
1000
50000
Level 7
Total bonus stats:
ATK: 170DEF: 55HP: 450Counter Bonus: 20%
5
600
60000
Level 8
Total bonus stats:
ATK: 220DEF: 70HP: 600Counter Bonus: 25%
5
600
80000
Level 9
Total bonus stats:
ATK: 270DEF: 85HP: 750Counter Bonus: 30%
5
600
100000
Level 10
Total bonus stats:
ATK: 270DEF: 85HP: 750Counter Bonus: 30%
10
1500
200000