LegionBound Builds: Beat the Endbringer on Loop 2+

Updated 2026-10-22: Correction: an earlier version called Mender a "Cleric Ascension" and Magus a "Wizard Ascension" (they are the Cleric's and Wizard's synergy classes, earned by promotion, not by merging), said three neighbouring classes give three synergy classes (they give two), told you to commit by wave 3, described Magus crowd control, Mender healing, loop 2 HP pools and aura adjacency rules with no source, and said a Mine building unlocks Smith recruitment based on a screenshot we couldn't trace to an official source. It also recommended the Infinite Skill Tree for looped Endbringer fights; the developer says only two skill tree nodes affect Adventure Mode. The images are now official Steam trailer and demo screenshots.

LegionBound Endbringer builds: quick answer

• Looping raises difficulty by 100% (trailer); the Endbringer also gains power while you travel (store)
• Only two skill tree nodes reach Adventure Mode: starting party size and starting heroes
• Our build: Guardian, Shield Mage, Battlemage, Wizard, Druid (four synergy classes from five heroes)
• Buildings decide who you can recruit; hold five and upgrade them
• Ascend chain heads only; Ascended heroes don't count as partners

What loop 2 changes

The store sets the rule: "all the meanwhile the final foe gains power. When you are ready to face the final foe, will you confront the Endbringer or loop back to the beginning to gain more power?" The trailer shows the choice screen, with The Final Battle (rated Vicious) next to a Loop card reading "Difficulty up 100%".

That's the whole official picture. Nobody has published HP or damage numbers for a looped Endbringer, and the older version of this page made some up. What you can plan around is that every map on the next pass gets harder too, so the loop has to buy you something specific.

What your build can use in Adventure Mode

Developer Zakreon's pre-launch Adventure Mode post sets the limits: "Your skill tree doesn't come with you so you have to unlock skills, heroes, and gain items as you go." A forum reply narrows it: "The only nodes that affect the adventure mode are starting party size and available heroes to choose at the start."

What you get instead:

• Skills from battles. The trailer's reward screen offers type-based picks, for example "Nimble: DEX based heroes get a +10% Speed boost" and "Double Down: STR based heroes have a 5% chance to deal double damage (before criticals)".
• Extra keystones. "The most unique part of Adventure mode is that you can stack extra Keystones and skills in ways you normally can't ever do!"
• Buildings. "There are 10 different buildings with different effects, and each one has unique heroes that become available for recruitment once built." You can hold five, and "you can upgrade them to increase their benefits by a huge amount."

Since skills and keystones are tied to hero types, a party that shares one type gets more from every reward. That's the logic behind our build.

Image: LegionBound release trailer on Steam (Spicy Garlic Games). Adventure Mode skill rewards are tied to hero types.

The build: Guardian to Druid

This is our pick, not an official build. In the Warrior group, five neighbours in a row give four synergy classes (Hero Class Guide):

Two Defense heroes promote at the front and three Magic heroes stack behind them, so Magic rewards and keystones cover most of the damage. The developer also says player spells scale with your Magic heroes ("Spell damage is determined by your MAG character's MAG stat"), which is one more reason to lean Magic.

If you have the slots, a second all-Magic chain is Sorcerer, Witch, Cleric: Sorcerer becomes Warlock with the Witch, and the Witch becomes Hexer with the Cleric. That's two more synergy classes from three Magic heroes.

Getting the Guardian. In Adventure Mode, a building has to enable recruitment. The Steam store screenshot of the Barracks lists "Enables Recruitment: Barbarian, Duelist, Guardian, Northman" for 150 coins, and says "Heroes gain 15% additional STR and CON". For this build, that's a building worth placing early.

Ascensions in a looped run

An Ascended hero carries both kits and, since Patch 1.05, "Ascended heroes with combined auras now correctly apply both auras." But Klokinator's synergy guide is clear that "Ascended Heroes do NOT count toward synergizing other units."

In the Guardian-to-Druid build, the Guardian is the head: nobody in the chain learns from it. That's your safe merge. Merging the Shield Mage would cost the Guardian its Bulwark; merging the Wizard would cost the Battlemage its Enchanter. The Ascension chain guide covers second and third merges.

The Infinite Skill Tree, and why it's a Battle Mode tool

A PSA on r/Legionbound reports a hidden layer: "Max out skill tree to unlock infinite skills", including both the "+5% Magic damage and -5% Physical damage" node and its inverse, and adds that "Once the infinite skills are unlocked, you can deactivate one of the damage skill node sets again. The infinite skills will still be available". We haven't confirmed it in game.

Either way, the developer's answer above means the skill tree stays home when you start an Adventure run, apart from party size and starting heroes. Use the Infinite Skill Tree for long Battle Mode pushes, not as Endbringer prep.

Screenshot: LegionBound Demo Steam store page (Spicy Garlic Games). The Battle Mode skill tree; in Adventure Mode only its party-size and starting-hero nodes apply.

Step-by-step: a looped Endbringer run

1. Recruit the Defense pair first. Guardian and Shield Mage; build the Barracks if you need the Guardian.

2. Extend into the Magic heroes. Battlemage, Wizard, Druid, in that order, so each one promotes the hero before it.

3. Take Magic and frontline rewards. Skills and keystones that match your types.

4. Upgrade buildings instead of spreading them. The developer calls the upgrade gain "a huge amount".

5. Ascend the Guardian only once the chain is promoted. Preview it first.

6. Loop only with a reason. If the party already clears its battles, take the Final Battle.

Our take

Most of what used to be on this page was guesswork. What's left is simpler and more useful: a loop doubles the difficulty, the skill tree mostly stays home, and Adventure Mode rewards parties that share a type. A Defense-into-Magic stretch of the Warrior group fits all three. Build it, level the buildings that recruit it, and merge only the Guardian.

Frequently Asked Questions

What are the best LegionBound builds for the Endbringer? No official one. Our pick: Guardian, Shield Mage, Battlemage, Wizard, Druid, plus Sorcerer, Witch, Cleric if you have room.

How does the Endbringer change on loop 2? The Loop card reads "Difficulty up 100%". No HP or damage numbers are published.

Does the Infinite Skill Tree help against the Endbringer? Not much: only the party-size and starting-hero nodes affect Adventure Mode.

Which buildings should I build? The ones that recruit your chain, upgraded rather than spread out.

Do Ascended heroes help? Yes, but merge the chain head; Ascended heroes don't count as partners.

Related Reading

• LegionBound Endbringer Guide: When to Fight and How to Win: Final Battle or Loop, and the first-pass fight.
• LegionBound Adventure Mode Guide: routes, rewards and buildings.
• LegionBound Advanced Builds: Late-Game Class Chains: chains, hero types and keystones.
• LegionBound Ascension Guide: the merge itself.
• LegionBound Ascension Chain Guide: second and third merges.
• LegionBound Warrior Group: All 14 Classes: the loop this build comes from.
• LegionBound Barkeep Group: All 11 Classes: the Dexterity alternative.
• LegionBound Tax Collector Group: All 4 Classes Loop: the closed four-class loop.
• LegionBound Boss Idol Guide: boss drops after the Patch 1.11 rework.
• LegionBound Tier List 2026: our ranking of the launch 30.
• LegionBound complete guide hub: every LegionBound guide in one place.

References

• LegionBound on Steam: Adventure Mode description, Barracks screenshot, Release Trailer
• Legionbound Demo on Steam: skill tree screenshot used here
• What is Adventure mode?!: developer post on buildings, keystones and the Endbringer
• Developer answers thread: skill tree in Adventure Mode, spell scaling
• Hero Class Guide: Myzri's Steam guide; partners and types
• Class Synergy/Promotion Guide: Klokinator's Steam guide; Ascended heroes and synergy
• Patch 1.05: Ascended heroes apply both auras
• PSA - "Infinite" Skill Tree: r/Legionbound community post