Union Skills

Union Skills are a game mechanic in Etrian Odyssey V: Beyond the Myth that closely resemble Limit Skills from Etrian Odyssey III: The Drowned City.

Overview

Every guild member, regardless of race, starts knowing the four common Union Skills, and can invest skill points to learn their race-exclusive Union Skills. All race-exclusive Union Skills, like Race skills, only require a single skill point to unlock, and the strength of some Union Skills scale with the level or stats of the initiating party member.

To use a Union Skill, only the initiating party member must have a full Union Gauge. If that Union Skill requires more than once participant, you will need to select cooperators from the rest of the party - cooperators can participate even if they have an empty Union Gauge. If a party member is already cooperating with another Union Skill, they cannot initiate their own Union Skill nor cooperate with another for this turn. Union Skills trigger at the start of the turn, and can be used in addition to the party member's normal action for the turn. Once executed, all participants' Union Gauges are completely drained.

Union Gauge

The party's Union Gauges are refilled to 100% whenever they leave the labyrinth, ensuring they start an expedition on a full gauge.

Every time a party member takes an action, the gauge fills by a random amount between 5% to 15%. This occurs even on turns where a Union Skill is initiated.

The Phantom Duelist Fencer's Dodge Boon grants bonus Union whenever they dodge an attack, with no upper limit to how much can be gained. The Omnimancer Warlock's Life Siphon triggers for every skill that hits an enemy's weakness, including offensive Union skills and their delayed Altar skill, potentially leading to a maximum of 33% Union Gauge in a single turn.

If a party member dies, their current Union Gauge is halved. After a victory in battle, all surviving party members gain 5-15% Union Gauge.

List of Union Skills

Common Union Skills

Analyze アナライズ
Union Skill Registers one enemy's details into the Monstrous Codex during battle. A keen eye opens the door to knowledge.

Double Attack ダブルアタック
Union Skill Two allies attack one enemy with their equipped weapons. Enemies that are out of range of a given ally's weapon will not be attacked by that ally. The attack is melee range with every weapon. Damage scales based on the user's level. Each hit uses the properties of each participant's equipped weapon, including any elemental imbues.
Level	1	99
Damage Per Hit	150%	400%
Total Damage	300%	800%

Full Retreat 全力逃走
Union Skill High chance to escape from battle and return to the floor's entrance. Flee your enemies at full speed. Warps you to the point from which you entered the current floor. Will always fail in certain battles. Escapes to the most recently used staircase or Geomagnetic Pole.

Mana Heal マジックヒール
Union Skill Slightly restores TP to the party. Ease your mind with a magical light. Total TP recovered is equal to the skill's base TP recovery, plus a percentage of the target's max TP.
Level	1
Fixed Base TP Recovery	6
TP Recovery (% Of MAX TP)	3%

Earthlain-exclusive

Blessing 祝福の光
Union Skill Slightly restores HP to the party at the end of the turn. Bathe your party in a blessed light. Cannot activate more than once per turn. Can be learned at any level. Requires one participant.
Level	1-49	50-99
HP Recovered (% Of MAX HP)	15%	30%

Resuscitate 簡易蘇生
Union Skill Revives one fallen ally. Two party members team up to raise a comrade. Accessible at level 5 or higher. Requires two participants.
Level	1-10	11-20	21-30	31-40	41-50	51-60	61-70	71-80	81-90	91-99
Revival HP	1	11	21	31	90	110	130	150	170	270

Tri-Shield トライシールド
Union Skill Negates up to three enemy attacks for one turn. Only damage-dealing moves can be blocked. Does not stack. Accessible at level 10 or higher. Requires three participants.

Black Mist 黒霧
Union Skill Decreases enemy resistance to binds and status ailments for one turn. A dark cloud envelops foes, making them more susceptible to ailments. Accessible at level 15 or higher. Requires four participants.
Level	1
Infliction Rate Multiplier	×2

Determination 不屈の闘志
Union Skill For one turn, may endure a lethal blow. Also blocks binds and status ailments. Endurance chance goes down with repeated use. Accessible at level 20 or higher. Requires five participants. Grants all party members immunity to binds and ailments for the turn of use, and a chance to endure lethal damage with 1HP remaining. Endure activation rate decreases by 10% per party member after every successful trigger.
Level	1
Activation Rate	50%

Celestrian-exclusive

Enchant エンチャント
Union Skill Imbues fire/ice/volt to the party's weapons for one turn. Grants elemental magic to the party's attacks. Does not stack. Can be learned at any level. Requires one participant.

Game Changer パラダイムシフト
Union Skill Transfers status ailments/binds from one ally onto all enemies. An ancient spell cures your ally while infecting your enemies. Accessible at level 5 or higher. Requires two participants.
Level	1
Infliction Rate	50%

Hex カースマジック
Union Skill For one turn, fire/ice/volt attacks may inflict a status ailment. Bestows a curse via allies' magic attacks. Does not stack. Accessible at level 10 or higher. Requires three participants.
Level	1
Infliction Rate	45%

Tri-Magic トリプルマジック
Union Skill Casts long-ranged fire, ice, and volt attacks on all enemies. Cooperate with allies to unleash a trio of spells. Accessible at level 15 or higher. Requires four participants. Damage scales with user's level. Deals three hits, one of each element type. Stat(s) used: INT
Level	1	99
Damage per Hit	100%	200%
Total Damage	300%	600%

Chain Blast チェーンブラスト
Union Skill Attacks and binds all enemies with a long-ranged, non-elemental blast. Everyone joins hands to restrict enemy movement. Accessible at level 20 or higher. Requires five participants. Inflicts almighty damage with a chance to inflict all three binds. Damage scales with user's level. Each bind is rolled separately. In the infliction formula, this skill uses $(LUC\times 2+INT)$, instead of $(INT\times 2+LUC)$ Stat(s) used: INT, LUC
Level	1	99
Damage	100%	300%
Bind Infliction Rate	150%

Therian-exclusive

Wide Swing 大振り
Union Skill Strikes all enemies with equipped weapon. Swing that weapon with all your might. Can be learned at any level. Requires one participant. Damage scales with the user's level. Uses properties of equipped weapon. Stat(s) used: STR
Level	1	99
Damage	100%	250%

Binding Force 気魄の楔
Union Skill For one turn, cut/stab/bash attacks may bind the enemy. Unrelenting force restricts enemy movement. Does not stack. Accessible at level 5 or higher. Requires three participants. Each physical attack inflicts a randomly-chosen bind.
Level	1
Infliction Rate	45%

Life Drain アタックヒール
Union Skill For one turn, the whole party recovers HP each time damage is dealt to an enemy. The enemy's loss is your party's gain. Does not stack. Accessible at level 10 or higher. Requires three participants.
Level	1
% Damage as Healing	30%

Tri-Attack トリプルアタック
Union Skill Long-ranged cut, bash, and stab attack to one enemy. A three-part shockwave strong enough to ravage the earth. Accessible at level 15 or higher. Requires four participants. Damage scales with the user's level. Deals a single hit using all three physical damage types at once. Stat(s) used: STR
Level	1	99
Damage	200%	450%

All-out Attack 一斉攻撃
Union Skill All five allies attack one enemy with equipped weapons. Also inflicts stun. Enemies that are out of range of a given ally's weapon will not be attacked by that ally. Accessible at level 20 or higher. Requires five participants. Damage scales with the user's level. Each ally's attack will use the properties of their equipped weapon. Stat(s) used: STR
Level	1	99
Damage Per Hit	100%	190%
Total Damage	500%	950%
Stun Infliction Rate	200%

Brouni-exclusive

Guard Order 守備の号令
Union Skill Decreases damage to the party for one turn. Commands allies to be on their guard. Does not stack. Can be learned at any level. Requires two participants.
Level	1
Damage Reduction	50%

Superspeed 電光石火
Union Skill Increases act speed of the party for one turn. Temporarily heightens ally mobility. Does not stack. Accessible at level 5 or higher. Requires three participants. All party members will act before enemies.

Forbidden Rite 禁忌の法
Union Skill Extends the duration of all active buffs and debuffs by one turn. A forbidden spell that prolongs bodily experiences. Applies to both enemies and allies. Does not stack. Accessible at level 10 or higher. Requires three participants.

Hygieia's Bowl ヒギエイアの杯
Union Skill Fully restores the party's HP, even from death. Also removes binds/status ailments. The party comes together to create an extraordinary panacea. Accessible at level 15 or higher. Requires four participants.

Aegis Shield イージスの盾
Union Skill Nullifies all attacks to the party for one turn. Only damage-dealing moves can be blocked. Accessible at level 20 or higher. Requires five participants.

References

• GameFAQs Therian Race Skill data by HououinMakise/Rea
• GameFAQs Brouni Race Skill data by HououinMakise/Rea
• GameFAQs Earthlain Race Skill data by HououinMakise/Rea
• GameFAQs Celestrian Race Skill data by HououinMakise/Rea