'Open 10 more times and receive a 2000 Yin and yang'

'Yin & yang' means '侌昜' or '陰陽' in sinograms, a classic Chinese philosophical concept.
I want to know that how to use '侌昜'?

'Behold the new stage in the maiden's leveling - cosmic maidens!

'A few facts about cosmic maidens:

• * Maiden can only be converted into a cosmic one after reaching level 25;
• * To convert the maiden into a cosmic one, new items is used - 侌昜 (Yin & yang)
• * The ability of cosmic maidens is charged with gems of any element;
• * Each cosmic maiden gets one additional unique perk;
• * When converted, the cosmic maiden receives a bonus of 265 damage.

'Today you can get the first cosmic maiden - Oceanid Pleione! The Pleione new perk - Stealing -  works as follows - every time an enemy charges abilities of his maidens, Pleione takes half of the gems for herself, charging her ability, and the enemy's abilities are charged 2 times slower.'

Now we understand that we can use 侌昜 (Yin & yang) to convert the maiden into a cosmic one.
But how to get it? Only in the Shop Myhtic Chest each 10 times of opening?