diamond/crystal

how can i get the diamond/crystal that allow me to unlock a new slot for the dragon?

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Yes exactly what he said above ^
they are called crystals and are very rare/hard to obtain in laputa my luck is 1 a day with luck

So, let's say I get 50 extra crystals (after unlocking the slot with 50 crystals), then I unlock the ability to place lv5 stones in that slot. So does that mean that I can also place a lv4 stone in there? And then if I do place a lv4 stone, do I have to get 50 more to place an lv5 stone? And how would this work for multiple dragons? And this would also allow for replacement of a lv1 qs stone for example, with a lv1 power stone?

So, let's say I get 50 extra crystals (after unlocking the slot with 50 crystals), then I unlock the ability to place lv5 stones in that slot. So does that mean that I can also place a lv4 stone in there? And then if I do place a lv4 stone, do I have to get 50 more to place an lv5 stone? And how would this work for multiple dragons? And this would also allow for replacement of a lv1 qs stone for example, with a lv1 power stone?

Q: So does that mean that I can also place a lv4 stone in there?
A: YES

Q: And then if I do place a lv4 stone, do I have to get 50 more to place an lv5 stone?
A: NO if you have already found 50 crystals and placed them down in order to place a lv5 stone you will not need additional crystals

Q: And how would this work for multiple dragons?
A: You will have to find individual 50crystals/50crystals for each dragon so i suggest you use the wisely

Energy Crystals take so long to get. I currently only have 17 and unlocked Laputa about 3 weeks ago. Most of my crystals have been through magic trades as well