Tier upgrade stone

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When and where will we get tier upgrade stone? 

0 1
Hi Rebirther! Answering specific questions about the gameplay is out of our support scope. Also, finding out about particular details within the game by yourself is supposed to be part of the fun!

However, you will most likely find our GUIDE BOOK helpful: https://rebirth.caretgames.com/en/guidebook/itembook.php