Infinity Train Guide

Infinity Train is one of the most exciting and rewarding game modes in Etheria: Restart. It functions like a roguelike dungeon run, where players face wave after wave of increasingly difficult enemy encounters. What sets Infinity Train apart is its strategic depth—it challenges you to survive across multiple rounds with no healing between battles, all while managing randomized buffs and debuffs that can shape the outcome of your run. The further you go, the better the rewards, making it a critical part of your daily routine once you’re strong enough to take it on.

Unlike other game modes, Infinity Train does not cost stamina to play. Instead, it consumes limited daily attempts, giving you the freedom to run it without draining your main progression resources. Each run begins with a base team and offers “Train Cards” between waves, which are random bonuses you choose from to enhance your team. These buffs might increase your team’s turn meter, add a chance to counterattack, or boost damage at the cost of healing. Choosing the right ones can be the difference between an easy victory and a quick defeat.

The mode rewards players with materials that are typically stamina-gated elsewhere in the game. Prowess materials, universal currency, shell enhancements, and upgrade items all drop from higher floors, giving you a major boost to your account’s development. As you climb higher, the value of each run grows exponentially. That makes Infinity Train one of the most efficient content types to farm, especially for free-to-play players.

Success in Infinity Train is all about team sustainability and control. You’re not just dealing with a tough boss or a single enemy wave—you have to manage your team’s resources across many battles. That means characters who can push turn meter, apply crowd control, and heal or sustain themselves will outperform traditional glass cannon builds.

Turn meter manipulation is one of the most valuable tools. Units like Chiaki the Echo and Kloss can either accelerate your own team’s rotation or slow the enemy’s, which gives you more breathing room between enemy attacks. Crowd control is also essential; units like Kraken, Obol, Lilith, and Kazuyo the Reverie can lock down enemy waves with stuns, freezes, or sleep, dramatically reducing incoming damage and extending your team’s longevity.

You’ll also want at least one source of healing or life leech. Freya is a stand out because she brings both turn meter push and passive healing through life leech effects. Characters like Tiamat also serve as self-sustaining tanks who can protect your backline and provide shields or heals over time.

Building around these core roles—control, sustain, and rotation—is much more important than pure damage output. A balanced, utility-driven team will almost always take you further than a team stacked with raw DPS.

Fortunately, many of the best characters for Infinity Train are available early on or through guaranteed events. Lian is a default pick with powerful AoE nukes and turn meter steal, making her both a primary damage dealer and a strong rotator. Freya, who many players can acquire early through summons, is another fantastic option thanks to her life leech, AoE presence, and flexibility.

Control specialists like Kraken and Obol are top-tier for this mode. Kraken’s stun not only [Freeze]s enemies in place but also prevents them from gaining turn meter, which gives you a significant edge in both PvE and PvP-style encounters. Obol doesn’t prevent turn meter gain but deals additional [DoT] damage, adding value over longer fights. Lilith, Kloss, and Kazuyo the Reverie offer more specialized forms of control like single-target stuns, sleep debuffs, or speed reduction, all of which help control the flow of battle.

Kloss is an especially good choice because she can apply a valuable [DEF-], and Rilmocha or Massiah are great for AoE wave clear. You can also consider Tiamat as a reliable tank and shield generator, especially useful if your other units are squishy or slow.

Shells can drastically improve your performance in Infinity Train, particularly those that offer bonus turn meter or increased speed. These are especially effective on your primary rotators and CC units. For example, giving Kraken a shell that provides turn meter gain each round will help them apply crowd control more frequently, keeping enemy waves locked down.

Make sure your shells are leveled to 30, even if they’re only purple rarity. This doesn’t cost any currency—just farming data—and significantly boosts the passive bonuses your characters receive. Prioritize shells that offer [HP], [DEF], and [SPD] bonuses for sustain characters, and [ATK] and [SPD] for AoE damage dealers.

After each wave, you’ll receive a choice between three Train Cards. These temporary buffs stack and can dramatically influence your run’s success. For example, cards that increase your entire team’s turn meter after each turn are incredibly powerful, especially when paired with already-fast characters. Counterattack cards also provide excellent value, particularly if your team has AoE attacks that hit all enemies when triggered.

However, some cards come with downsides. Cards that boost damage at the cost of healing can backfire if your sustain is already fragile. Be selective, and build your run around synergy—if you’ve already chosen turn meter boosts, consider leaning into cards that scale with frequent actions or benefit from rapid skill cycling.

Infinity Train offers valuable rewards at every tier, and pushing just a little further can unlock substantial bonuses. Even a modest run can grant universal currency and prowess materials, while high-level clears unlock gold-tier upgrade packs, which are often the bottleneck for character development.

To make the most of your attempts, it’s best to run Infinity Train near the end of your play session—after you’ve done all your upgrades, enhancements, and summons for the day. This way, your team is as strong as possible before you spend your daily attempts. This approach will help you reach higher floors and secure better rewards without wasting opportunities on underpowered teams.

Infinity Train is a great example of stamina-free, progression-rich content done right. It rewards thoughtful team building, smart skill rotation, and long-term planning. With no stamina cost and a ton of resource value, it’s one of the best ways to improve your account quickly.

As long as you build around the fundamentals—speed, sustain, and crowd control—you’ll push further each day. And as your roster grows, Infinity Train will scale with you, continuing to offer powerful rewards long into the late game.

If you’re just starting out, focus on building Lian, Freya (if you pull her), and a couple of control units like Kraken or Obol, and you’ll have a strong Infinity Train team in no time. Just don’t forget—this is a mode of survival, not burst. Control the pace, manage your buffs, and enjoy watching your squad climb the train to glory.