Ruan Yi Boss Guide

Ruan Yi boss guide in Arknights: Endfield. This guide includes how to beat Ruan Yi, recommended teams, attacks & moves, how to unlock, and rewards.

Ruan Yi Boss Strategy and Tips

A Boss Split into Two Phases

Ruan Yi is a boss split into a first phase in a normal state and a second phase after entering an Enraged state.

Once its initial HP is depleted, the boss recovers to half HP and enters the second phase while deploying gimmicks, so you must defeat it again after breaking the gimmick.

Collect All Xiranite Energy Orbs

During combat, the boss may deploy a barrier that makes it invincible. Since attacks won't connect, breaking the barrier is mandatory, stop attacking and collect the Xiranite Energy (green orbs) around the area to disable it.

Appears Around 2 Minutes After Starting

In the first phase, about 2 minutes after the battle begins, the boss deploys an invincibility barrier, and green orbs appear. Ignore the boss temporarily and focus on collecting the green orbs. Be careful to avoid incoming attacks while doing so.

Signals the Start of the Second Phase

When HP is depleted for the first time, the boss recovers to half HP and deploys an invincibility barrier. Collecting all green orbs on the field will trigger a Stagger, allowing your attacks to connect again.

Avoid the Wrothful Roots of Bane

At the start of the second phase, Wrothful Roots of Bane (red orbs) appear alongside the green ones. Getting close will trigger an explosion that deals Massive DMG, so collect the green orbs carefully while avoiding the red ones.

Prepare and Level Up If Struggling

The boss uses wide-area attacks with short animations, making it difficult to dodge consistently. Strengthen your team and bring enough recovery items to avoid being overwhelmed.

Aim for Level 80 for Story Progression

The story version of Ruan Yi is Lv65, so it’s recommended to raise your characters to Lv80. Also upgrade your weapons, craft gold-tier Gear, and prepare recovery items before challenging him.

Ruan Yi Notable Attack Patterns

Tackle

If you are attacking at close range, the boss may suddenly perform a tackle with almost no wind-up, making it very dangerous. If you're struggling to maintain HP, consider switching to a ranged character or an Arts unit to attack safely from a distance.

Shockwave Attack

The boss flies around and generates water shockwaves across the ground. While you can jump to avoid them, the 5th wave overlaps and is harder to dodge, so it's best to use a dodge to avoid multiple shockwaves at once.

Red Orb Deployment

This is a powerful move triggered when the boss's HP is depleted. It recovers half of its HP and deploys both red and green orbs.

Avoid the red orbs while collecting the green ones to break the gimmick and trigger a Stagger. Keep in mind the boss will continue attacking, so stay alert to avoid getting hit from unexpected angles.

Ruan Yi Recommended Teams

Endministrator Physical Team

DPS	Vulnerable	Recover SP	Healer
Endministrator	Chen Qianyu	Pogranichnik	Ember

A Physical team centered around the Endministrator. Since Ruan Yi deals heavy damage, using Ember to improve survivability makes the fight more manageable. Build up Vulnerable with Chen's Battle Skill and Combo Skill, then consume it with the Endministrator's Battle Skill to deal damage.

Alternative Characters

Character	Notes
Snowshine	- Replace Ember - Easy-to-use healer - Improves survivability with Combo Skill
Ardelia	- Replace Ember - Healer who can recover HP with Battle Skill and Ultimate - Can also contribute damage via Physical Susceptibility
Lifeng	- Replace Ember - Offensive option if a healer is not needed - Be sure to prepare recovery items
Akekuri	- Replace Pogranichnik - Recover SP role that can also provide damage buffs - Guarantees a Stagger in the second phase

Yvonne Solidification Team

DPS	Cryo Amp	Cryo Infliction	Damage Support
Yvonne	Xaihi	Tangtang	Perlica

A Solidification team centered around Yvonne. Use Tangtang's Battle Skill followed by Yvonne's Battle Skill to apply Solidification while triggering Combo Skills for strong damage output. Time Yvonne's Ultimate with the gimmick break in the second phase to deal a large burst of damage.

Alternative Characters

Character	Notes
Gilberta	- Replace Tangtang or Perlica - High-multiplier Arts debuffer - Greatly boosts Yvonne's Ultimate damage
Snowshine	- Replace Tangtang or Perlica - Easy-to-use healer - Can utilize Cryo Infliction from Battle Skill
Estella	- Replace Tangtang - Fast Cryo Infliction role - Can trigger Combo Skill in response to Solidification
Alesh	- Replace Perlica - Recover SP role for Solidification teams - Best used with Gilberta or Estella

Laevatain Heat Team

DPS	Heat Infliction	Recover SP	Healer
Laevatain	Wulfgard	Akekuri	Ardelia

A Heat team centered around Laevatain. Use her Battle Skill at 4 Melting Flame stacks to charge her Ultimate quickly. If HP gets low, use Ardelia's Battle Skill or Ultimate to recover.

Alternative Characters

Character	Notes
Antal	- Replace Akekuri or Ardelia - Strong single-target damage option - Be careful managing HP when replacing Ardelia
Snowshine	- Replace Ardelia - Easy-to-use healer - Helps set up Combustion with Battle Skill

Ruan Yi Unlock Conditions

Fight in the Main Story Chapter 2

Ruan Yi is encountered in Main Story Chapter 2, Process III: "Surging From a Withered Spring". There is a warp point right before the fight, so make sure you are fully prepared before progressing through the Qingbo Stockade storyline.

Replay via Protocol Space

After clearing the fight once, you can challenge Ruan Yi again through RE-Crisis in Protocol Space. In RE-Crisis, rewards are available on the first clear, so it's worth attempting.

RE-Crisis: Ruan Yi Rewards

Defeat Ruan Yi Under 200s for a Medal

Defeating Ruan Yi within 200 seconds in RE-Crisis grants you a medal. The requirement is quite strict, so it is recommended to fully level your characters before attempting.

Rewards List by Level

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