SD Gundam G Generation ETERNAL: Eternal Road Expert 15 F2P

To clear Eternal Road Expert 15 and simultaneously complete both the Development-only restriction and the 10-unit survival mission in SD Gundam G Generation ETERNAL, deploy a full team of farmable mobile suits carrying the One-Hit Lethal tag. Because farmable units lack the base durability of gacha units, success depends on baiting enemies into isolated lanes, bursting priority bosses down in single turns to eliminate counterattacks, and physically blocking damaged units from harm.

Team Requirements and Squad Composition

Fulfilling the stage missions in a single attempt requires deploying ten Development-origin units. Before starting the stage, ensure all ten units have reached their maximum basic development tiers, character level caps, and fully unlocked weapon grids. Missing stats or accuracy penalties will break your damage thresholds and expose fragile units to lethal counterattacks.

Filter your Development inventory for units featuring the One-Hit Lethal tag and single-hit, high-potency armaments—such as concentrated sniper rifles, heavy beam sabers, or anti-ship swords—rather than multi-hit vulcan or rapid-fire weaponry.

Role	Priority Development Traits	Tactical Purpose
Primary Burst Attackers	One-Hit Lethal tag, high single-hit weapon power	Shatter elite enemy armor and eliminate bosses in a single combat action.
Secondary Strike Units	Long-range reach, moderate single-hit damage	Soften frontline units from outside retaliation range.
Defensive Anchors	High HP, defensive posture, damage mitigation	Intercept aggro and screen vulnerable glass-cannon attackers.
Support Buffers	Accuracy boosts, passive offensive buffs	Guarantee burst attacks land reliably without missing critical damage checks.

Early Map Positioning and Grid Control

Enemy forces on Expert 15 advance aggressively once your units enter their threat zones. Moving forward recklessly will result in concentrated enemy fire that development units cannot survive.

Turn 1 (Formation): Keep your squad in a tight cluster just outside the maximum reach of enemy weapons. Move your sturdiest defensive unit slightly ahead of the group to serve as an aggro anchor, baiting the lead vanguard forward without letting enemies hit your damage dealers.
Turn 2 (Engagement Pocket): Allow the enemy vanguard to close into your firing lane. Soften approaching targets with secondary long-range units first. Once an enemy enters lethal range, commit a One-Hit Lethal skill to secure an outright kill, preventing counterattack damage during the exchange.

Boss Targeting Priority and Threat Management

Command units on this stage carry long reach and area-of-effect skills that can wipe out a farmable lineup if left unattended.

Focus Single Targets: Identify the enemy commander with the widest range or highest burst potential and focus your entire offensive rotation on it. Splitting damage across multiple targets leaves threats alive to counterattack during the enemy turn.
Conserve High-Damage Cooldowns: Before spending a major skill command on a weakened foe, check the combat preview. If a basic attack from a support unit will finish the target, save your primary burst skills for incoming reinforcement waves or secondary elite targets.
Check Accuracy and Counterattacks: Never initiate an attack if the combat forecast shows a low hit probability or exposes your attacker to lethal retaliation. If an attack is too risky, pass the turn in defensive guard mode.

Protecting the 10-Unit Survival Condition

Development units do not possess the large regenerating barriers typical of banner suits, making any damage taken difficult to recover. Maintaining the 10-unit survival threshold requires strict field management:

Rotate Injured Units Backward: When an attacker takes counterattack damage, immediately cycle it to the rear of your formation on the following turn.
Block Movement Lines: Place full-health units in choke points. Enemy units cannot pass through your deployed mobile suits, so position your defensive anchors to physically block opposing melee units from reaching damaged allies.
Monitor Enemy Threat Ranges: Before confirming your turn actions, check all enemy targeting lines. Ensure no damaged suit remains exposed inside an enemy firing cone.