Cost courtesy of Luda. Method courtesy of Dante

  • 10
  • 30
  • 80
  • 120
  • 220
  • 100
  • 220
  • 300
  • 350
  • 380
  • 350
  • 280
  • 300
  • 300

Lita, destroyer, 100% lock invisible commanders, a 2 lap monopoly event.

Every missing Berserker Crystal costs 10 credits.

Berserker Pack costs 199 credits, can buy 10 packs every day.

My average drop rate on 12 March for 10 Berserker Pack was 25 Berserker Crystal
My average drop rate on 13 March for 10 Berserker Pack was 16 Berserker Crystal

To make sense to buy Berserker Packs instead of using credits, the average drop rate for Berserker Packs has to be 20 or more Berserker Crystals. If not you will be paying more.

Possible cheaper method
The first complete lap (i.e. go all the way to get 40 Lita parts), should cost about 30K credits, along the way, you should be able to get more Lita parts (there are a lot of squares with Lita parts.

My experience yesterday, spending 27K, was able to get 66 parts. That means 14 parts required, going all the way to the end would not make sense, as will very likely have more than 80 parts. So methods suggested is to reset after throwing the dice 2 or 3 times to get the parts with lesser Berserker Crystals or Credit costs required.

Note 1: During the event, Lita augmentation is 100% success.

Note 2: Because Lita is a destroyer, with 0 ATK, she is very vulnerable to Slade with the Deal 150 % of previous total damage to enemy with lowest ATK" i.e. Slade T-I, T-II, T-III, T-V and Slade S-I, S-II, S-III, S-VII, S-VIII, S-IX.