Etheria: Restart’s Union Bosses, also known as Wyrms or Anchor Recon, are powerful raid bosses that require coordinated strategies and elemental advantages. Here’s a practical guide to beating all the three Union (Anchor Recon) bosses and reliably pushing for S/SS/SSS scores. This focuses on mechanics, team-building, speed tuning, and run execution so it’s usable for daily attempts and union progress.
Red Wyrms
Red Wyrm applies burn stacks that deal damage on your unit’s turn. Its attacks hit harder based on how many stacks remain. It takes 200% damage from blue units. Prioritize fast units and turn manipulators.
Rosa is the top pick for Reason Wyrm, benefiting from Odd-element bonus damage and high single-target output. Pair her with Khloros for strong neutral DPS and good support effects like Lily, Kazami Kazuyo, or Mio to keep rotations fast and burst windows clear. Debuffers with Slow/Weaken/DEF Down like Heid or Doki Doki can establish and maintain safe windows for players despite constant reaction and SPD-/ATK-, or alternatives like BIC/ATK- DEF-/ HP- are strong for long battles with constant big team damage. Rin is a great budget option as building her for around 200 Speed with solid Damage and Damage Reduction from Heino and assistance helps provide a push.
Lingjiao is a great support if your red team lacks offense or is fragile to survive. Red Chiaki can reduce incoming damage with Origami Guardian and her Tenacity, while also helping with recovery. Xiada team featuring Viper: This is perfect if your 4 star version is strong enough. Xiaoda, Lingjiao, Viper, Doki Doki, and Heino are all great picks here.
Honorable mention to Klos — her debuffs are irreplaceable here, even though the weak element the damage reduction and damage increase she brings to the boss is invaluable.
Green Wyrm
Green Wyrm will do significantly more damage if you have less than 2 buffs and buffs its own attack. It takes 200% damage from red units. So buffers and strippers are king.
Khloros is the top pick for Wyrm Hollow thanks to his positive affinity and ability to thrive in single-target fights, even without providing buffs himself. Pair him with buff-heavy supports like Doki Doki, whose undispellable Backup and Rhapsody, maintain uptime while boosting speed and meter, or Hoya, whose Weaken stacks, DEF-, and counterattacks deal both teamwide and Wyrm damage. Heid offers similar tanky utility with Sound Barrier, while Lily and Gekko power DPS with her Ten Trick for burst at safe windows.
Lingjiao is the premier healer here—despite her weak affinity—since her heals scale with buffs, she extends buffs, and her special/ult remove debuffs. Good picks requiring less investment are Dorothy or Dorothy the Wishweaver; both provide excellent healing, like Leech, Crit Rate, and utility. Red Chiaki is also excellent with Origami Guardian that provides an instant heal, tank, and safe statuses.
If you are struggling with uptime consider Timeweave/Annihilator on your primary buff units.
Blue Wyrm
Blue Wyrm will periodically reduce your defence and damage done with a debuff and mitigate its own damage taken with a buff. It takes 200% damage from green units. Defense buffs and debuff cleansers are most important.
A common misconception is that the Weakness Gaze debuff will drop 1 stack per turn, this is not true. Therefore purifiers such as Doki Doki, Lingjiao, and Chikaki the Echo are mandatory, with Doki Doki standing out for always clearing Weakness Gaze while boosting speed and turn meter.
Immunity providers like Cachi the Guard, Lingjiao, and Heiki grant temporary protection from stacking debuffs, allowing EZ DPS to act safely.
Another common mistake is assuming that Weaken can be dispelled or that it is blocked— it can’t. This turns the fight into a battle of attrition, where damage reduction units like Viper and Klos, strong healing support, become essential as Wyrm pushes a sustained damage output. To keep your team safe, bring Hoya, or a single-target DPS your support follow with Takeover then a debuff such as to get the 100% damage bonus. Don’t forget your Damage and Defense (ATK- and DEF-) to keep both your damage output and survivability consistent.
Dark Wyrm
Dark Wyrm will do significantly more damage if they have less than 2 debuffs. It takes 200% damage from light units. Debuffers and debuff extenders are most important.
Kloss and Heinrich form the ideal core here—Kloss offers DEF-, SPD-, and Hach in debuff for massive team damage boosts and enemy damage reduction, while Heinrich adds, Block, Wound, and teamwide Crit bonuses through Last Words.
From there, you can round out the team with high-temp supports like Doki Doki, Chiaki the Echo, Lily, or Kazami Kazuyo to maintain your rotation speed, and Light unit damage dealers like Masashi or Yeti to capitalize on the boss.
For budget options you will need to mix and match unique debuff kits to try and keep a good number of debuffs on the boss. Viper (SPD– ATK–), RC7 (ATK DEF–), Neil (Vulnerable) and Dinah (DEF– Vulnerable, Corrosion) are good options assuming they can survive.
Light Wyrm
Light Wyrm will gain 15 stacks of damage reduction and do bonus damage based on stacks. It takes 200% damage from dark units. Multi-hitters and turn manipulators are most important.
This fight is all about momentum—your ability to cycle turns and land multiple hits before the boss refreshes its big attacks. Prioritize Speed Up/AP Push, then multi-hit DPS. Skills like Slicing Wind, Quick Follow, and stances that strike several times per action effectively shred the boss’s DR stacks. Don’t over-invest in debuffers like Klos, or in Vulnerables here; DR removal and AD from damage-based tools.
Speed control is just as important, units like Lily, Kazami Kazuyo, and Doki Doki help the rest of your roster take more turns; pair them with multi-hitters and a single target Dark DPS to convert stacks into damage.
Sustain: Shields and damage reduction are the safest options; well-timed barriers blunt the boss’s early damage while stacks are still high. Reactive heals can work as a supplement but shouldn’t be the plan.
Build your team to clear Shield of Light stacks fast, then choose your best burst at low DR. By maintaining tempo and stacking debuffs, you can maintain punishment.
Read Also – Shell System Guide
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