Be The Final Boss Mutations Guide: All Mutation Effects and How to Get Better Units

When summoning minions in Be The Final Boss, you may occasionally notice special units with labels such as Shiny, Cursed, or Demonic displayed above their heads. These special versions are known as Mutated Units, and they are significantly stronger than their standard counterparts.

Although mutated units require more Souls to obtain, the increased combat power can make a huge difference when tackling tougher content, progressing through stages, or strengthening your overall army. Understanding how mutations work and knowing which ones are worth targeting can help you build a stronger team much faster. This guide explains every mutation currently available, their exact stat bonuses, and the best ways to improve your chances of obtaining them.

What Are Mutations in Be The Final Boss?

Mutations are special enhancements that can appear on units summoned from the Summon Altar. A mutation boosts a unit’s core combat stats, making it considerably stronger than the regular version of the same character.

When a unit receives a mutation, the bonus is applied directly to its Attack (ATK) and Health (HP) values. Since these two attributes heavily influence overall combat effectiveness, mutated units generally perform much better in battle.

However, it’s important to understand that mutations do not improve every aspect of a character. While HP and Attack receive substantial boosts, abilities and attack range remain unchanged.

Mutations Affect:

• Attack (ATK)
• Health (HP)
• Overall combat power

Mutations Do Not Affect:

• Active skill damage
• Passive skill effects
• Attack range
• Ability mechanics

Because of this, mutated units are primarily valued for their improved survivability and raw damage output.

All Mutations and Their Stat Bonuses

There are currently three mutation types available in Be The Final Boss. Each one provides a different level of enhancement.

• Shiny Increases ATK and HP by 30%
• Cursed Increases ATK and HP by 100%
• Demonic Increases ATK and HP by 150%

The stronger the mutation, the greater the overall power increase your unit receives.

Shiny Mutation Explained

The Shiny mutation is the most common mutated variant players will encounter. A Shiny unit receives a 30% increase to both Attack and Health, making it noticeably stronger than the normal version. While the boost is not massive compared to higher-tier mutations, it still provides a useful advantage during early and mid-game progression.

You can easily identify these units by the “Shiny” label displayed above their head and at the beginning of their name. For newer players, Shiny units are often worth using until stronger mutations become available.

Cursed Mutation Explained

The Cursed mutation offers a much larger improvement and is considered one of the most desirable upgrades for powerful units. A Cursed unit gains a 100% increase to both Attack and Health, effectively doubling these core stats. This substantial boost dramatically improves damage output while also making the unit significantly harder to defeat.

Like other mutations, Cursed units display the “Cursed” title above their head and as part of their unit name. Because the stat increase is so significant, many players aim to replace standard units with Cursed versions whenever possible.

Demonic Mutation Explained

The Demonic mutation is currently the strongest mutation available. Units with this mutation receive a massive 150% boost to Attack and Health, making them some of the most powerful versions of any summon in the game.

A Demonic unit not only deals far more damage than its normal counterpart but also possesses greatly increased durability, allowing it to survive longer during difficult encounters. These units are identified by the “Demonic” title displayed above their character model and in their name. For players chasing the strongest possible army, Demonic units should be the ultimate goal.

Which Mutation Is the Best?

If your objective is maximizing combat performance, the ranking is straightforward:

1. Demonic (150% ATK and HP)
2. Cursed (100% ATK and HP)
3. Shiny (30% ATK and HP)

Demonic mutations provide the highest overall stat increase and are therefore the most valuable variant to obtain. However, because stronger mutations are generally rarer, Cursed units are still excellent alternatives and can carry players through most content. Shiny units remain useful early on, especially if you have not yet obtained Cursed or Demonic versions of your preferred summons.

How to Increase Mutation Chances

Getting mutated units largely comes down to luck, but there are currently two methods that can improve your odds.

Summon During Cursed Moon Weather

The best free-to-play method is taking advantage of the Cursed Moon weather event. When this weather condition is active, the chance of obtaining mutated units is increased by 2x. This bonus applies to all mutation types, making it one of the most important events to watch for when spending Souls. Players looking to maximize efficiency should save their summoning resources and wait for Cursed Moon whenever possible.

Buy the Double Mutation Chance Gamepass

Players willing to spend Robux can purchase the Double Mutation Chance gamepass from the in-game shop. This gamepass provides the same 2x mutation rate bonus as the Cursed Moon event, but the effect is permanent rather than temporary. The gamepass costs 159 Robux and is currently the only paid method available for increasing mutation odds.

Best Strategy for Farming Mutated Units

If you’re trying to build a roster filled with powerful mutated summons, follow these recommendations:

• Save Souls for major summoning sessions.
• Wait for Cursed Moon weather whenever possible.
• Prioritize obtaining mutated versions of your strongest units.
• Replace normal units with Cursed or Demonic variants as upgrades become available.
• Focus on long-term roster improvements rather than spending Souls immediately after earning them.

Patience often results in significantly stronger summons and better resource efficiency.

Mutations are one of the most important progression systems in Be The Final Boss, allowing players to transform ordinary summons into significantly stronger combat units. While Shiny variants offer a respectable boost, Cursed and Demonic mutations provide the largest power gains and are the versions most players should aim for. By timing your summons around Cursed Moon events and prioritizing high-value mutated units, you can build a much stronger army and advance through the game’s challenges far more efficiently.