According to information from leaker HomDGCat, in version 1.4 of Honkai: Star Rail, miHoYo has an interesting surprise for players (no longer a surprise when you read these lines). Accordingly, a new card game called 'Aetherium Wars' will be launched to help Honkai: Star Rail players have more to do in this game.
Read more: How to update Honkai: Star Rail 1.3?
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Based on the description, Aetherium Wars seems to be a version... Pokémon of Honkai: Star Rail. This card battle game has conquered the Honkai: Star Rail universe and is highly favored. In the game, you can collect data from every living creature and transform them into Aether Spirits. From there, we can gather, train, battle, and upgrade these Aether Spirits.
- There are specific rules, where you'll battle opponents using Aether Spirits.
- You can duel with other players.
- After the launch event ends, the card battle game will still exist.
- The event's reward includes 4 four-star characters mentioned by Mytour: Serval, Pela, Luka, Hook.
According to Mytour, this event won't force Honkai: Star Rail players to play cards from A to Z. It will just be one of the various activities, similar to events Genshin Impact players had in version 3.7. Rewards will include various materials and up to 1,000 Star Crystals, similar to other major events introduced before.

However, it must be acknowledged that many Honkai: Star Rail players feel that the game is 'weak' in terms of storyline. The main missions of patch 1.3 are disappointing because they're too short, lack important information, and don't push the storyline forward. Hopefully, after returning to Belobog in patch 1.4, miHoYo will accelerate the pace to take players to the next 'meeting point,' which is the planet Penacony.