Valerian, a unique existence among SR characters, is bestowed with the title of Eternal Slumber. He appears to be an unreliable unlicensed physician, but beneath this unreliability lies a hidden secret. To fully grasp how to play Yser Valerian, one needs in-depth understanding. This character actually has some control attack effects, so when used well, players can even form a specialized team in the game.

Due to certain special reasons, Valerian's lifestyle differs greatly from that of ordinary people. She falls into a unique sleep pattern, where the time spent sleeping far exceeds the time being awake. This lifestyle makes her appear lazy and apathetic, as if she doesn't care about the world around her. The skill Deep Dream is related to this characteristic and is also a unique attack method. When used, it targets a single enemy, causing damage equivalent to 200% of the attack power.
In addition, this skill has a 20% chance to put the target into a sleep state for one turn. Enemies in the sleep state cannot perform any actions, but once they receive damage, this effect is immediately canceled, and the damage received increases by 25%. As the skill level increases, at level 2, the base damage coefficient rises to 220%, and at level 3, the probability of adding the sleep state increases to 30%. When the skill reaches level 4, the base damage coefficient increases again to 240%, and finally, at level 5, the probability of adding the sleep state increases to 40%.

The skill Phantom is a supportive effect that Valerian can use. When using this skill, she can grant a teammate invincibility for one turn and provide all teammates with a continuous recovery effect for two turns. If the targeted teammate's health percentage is below 70%, the duration of the continuous recovery will be extended by one turn, ensuring the team receives more healing support during critical moments. Teammates in the invincible state will not take any damage, which is crucial for protecting vulnerable teammates or key characters. Continuous recovery heals the holder for 15% of their maximum health at the start of each turn, helping teammates maintain stability in battle.
As the skill level increases, at level 2, the condition for triggering additional recovery drops from 70% to 60%, making the skill effective in more situations. At level 3, the duration of continuous recovery increases to two turns. At level 4, the trigger condition returns to 70%. Finally, at level 5, the cooldown of Phantom decreases by one turn. The ultimate skill Deep Sleep is a powerful team support skill that redistributes the current health values of all teammates, balancing their health percentages.

This effect ensures no team member has excessively low health, avoiding easy defeat by enemies, while also restoring lower-health teammates, enhancing the team's overall survival capability. Upon casting Deep Sleep, Valerian enters a Hazy Dream state for two turns, during which she is immune to all control effects and action progress effects but cannot perform any actions. This design ensures Valerian can protect herself in critical moments while balancing the skill's effectiveness through limited actions.
At the start of each teammate's turn, Valerian grants them a shield equal to 13% of her maximum health and a basic buff effect that the teammate does not already have, such as increased attack, defense, critical hit rate, or speed. Additionally, when any ally is about to fall, Valerian immediately heals them for 35% of their maximum health and ends her Hazy Dream state. This mechanism ensures Valerian can save endangered allies at critical moments and rejoin the battle when necessary.

That concludes the introduction on how to play Yser Valerian. As these skills increase in level, the shields she provides to teammates significantly increase, and she also has some ability to save allies when they are about to fall. Therefore, her protective and support control abilities are quite useful.