Greetings,

Truffles is available to purchase via the current time limited promo pack.

However he is not actually required in order to complete the Christmas
event. He can make it a bit easier though.

Please note that you can still obtain the reward for the scene without Truffles. The only difference is if you assign all 5 characters to a scene in the game, you will always get the item every time. Using less means there is a chance you might not get it and will have to try
again.

The more characters you assign (below 5), the higher the chance of receiving the reward!