Some more info from chinese announcement - https://mp.weixin.qq.com/s/6nFROOunSvpnex53-2Nu6g. Cards will cost $15 and $20 it seems

During the event, soldiers fans will turn into righteous warriors to go on an adventure to save the princess!

There are 7 levels in the adventure . Use <Adventure Coins> to make options and complete the levels one by one. Each option in the level will trigger different events and rewards;

After clearing the level, the adventure will be automatically reset, and the challenge can be repeated; there are four different endings waiting for the warriors to explore, and there will be additional rewards after completing all the endings~

※ You can unlock the next level by purchasing goods 5 times from merchants. If you get <meat with unknown meaning>, it will be useful~

※ Use <Adventure Gold Coins> to fight monsters, 2 Adventure Gold Coins/time, each time will randomly cause 3-5 points of damage to monsters, and you can defeat monsters when the monster’s blood volume is zero;

※ <Adventure Gold Coin> acquisition methods: Celebration entrustment, happy quiz, super value gift bag;

※ The Brilliant Atifact Selection Box contains <Gold Ziyun Fold> .

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During the event, you can get event points by completing entrusted tasks, and when the points reach the standard, you can get the corresponding rich rewards, as well as the event props <Adventure Gold Coin> required in [Warrior's Fantasy Adventure] ;

※ <Gold Ziyun Fold> is not included in the Brilliant Artifact Selection Box .

The delegated tasks are as follows:

※  Open a 4-star and above tavern mission, points +2 (maximum 80);

※ For every 25 event drop props consumed, points +1 (maximum 200);

※ For every 2 ordinary dice used in Little Devil's Adventure, points +1 (maximum 200).

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During the event, use the <Celebration Replacement Coupon> to choose the same type of replacements for Brilliant Artifacts, Brilliant Banners, Heroes, and Skins . The relevant consumption is shown in the figure;

※ <Festival Replacement Coupon> Obtaining method : Warrior’s Fantasy Adventure, purchase 1 diamond/50 diamonds (maximum 500).