How to get dice of your choice from 1x1 to  6x6 ( event quest daily  ) 

you need first to have x 5 weeds 

u can obtain it from the market place or gathering wild herbs .

next go to Florin 

and talk to Kunata Don

accept the quest (event) herb bloomed from despair 

give 5 weeds 

u can chose one out of 6 

For me i chose 6x6