Be The Final Boss: How to Summon Minions Guide

Learn how to use the Summon Altar in Be The Final Boss. Discover how to use Souls, set up auto-roll targets, and manage placement capacity.

Official mediaLearn how to use the Summon Altar in Be The Final Boss. Discover how to use Souls, set up auto-roll targets, and manage placement capacity.YouTube

In the Roblox castle defense game [UPD1] Be The Final Boss, players defend a castle as the final boss while waves of heroes attack. To successfully defend your keep, you must understand be the final boss how to summon minions to build a powerful army. Minions are recruited at the Summon Altar using Souls collected from defeating endless hero waves. Once you roll a unit, you must review its stats, verify your placement capacity, and position it in your defense layout.

Whether you roll manually or use the built-in auto-roll feature, managing your resources and capacity is the key to surviving higher waves.

The Summoning Loop and Currency Mechanics

Summoning minions requires a clear understanding of the game's economy. A common mistake is assuming that Coins or other secondary currencies are used at the Summon Altar. In public gameplay, Souls are the exclusive currency used to fund altar rolls.

You earn Souls by defeating incoming hero waves. As you defeat more heroes, they drop Souls, which feed directly into your summoning budget. This creates a gameplay loop: defend the castle, collect Soul drops, visit the Summon Altar, and roll for stronger units to defend against even tougher waves.

To maximize this loop, players rely on two primary mechanics:

Soul Drops: The steady flow of Souls gathered during active combat phases.
Summon Luck: A mechanic that influences the rarity and mutations of the units you pull from the altar.

Resource	Primary Source	Main Purpose at the Altar
Souls	Defeating hero waves	Currency spent to roll for new minions
Summon Luck	Game progression & upgrades	Increases the chance of obtaining high-rarity units
Fusion Shards	Wave rewards & progression	Used to upgrade and fuse existing units

Step-by-Step Summoning Workflow

To build an efficient defense, you should follow a structured sequence when summoning. This workflow remains the same whether you prefer to roll manually or utilize the game's built-in automation tools.

1. Accumulate a Soul Budget

Before approaching the Summon Altar, complete enough hero waves to build a substantial reserve of Souls. Rolling with a tiny budget limits your chances of finding a unit that can meaningfully improve your defense.

2. Access the Summon Altar

Navigate to the Summon Altar interface within your castle. Here, you will see the active options for rolling, including manual single rolls and the auto-roll configuration panel.

3. Configure Your Roll Settings

You can choose to click manually for each roll, or you can use the built-in auto-roll controls. If you use auto-roll, configure the interface to stop at a selected rarity target. Using the game's official, visible auto-roll controls is highly recommended over using external auto-clickers, which do not respect rarity stopping points and may waste your Souls.

4. Review and Compare Results

When a roll completes, do not immediately discard your existing units. Open your owned-unit and placement panels to compare the newly summoned minion against your active defenders.

5. Place and Test

Place the new unit into your defense formation. Test its performance against a familiar wave checkpoint before spending scarce resources like Fusion Shards to upgrade it.

Step	Action	Focus Area
Step 1	Accumulate Souls	Wave Defense
Step 2	Open Altar UI	Interface Navigation
Step 3	Set Auto-Roll Target	Rarity Configuration
Step 4	Compare Stats	Unit Evaluation
Step 5	Place & Test	Formation Verification

Managing Placement Capacity and Altar Slots

A common point of confusion occurs when a player successfully rolls a powerful new minion but cannot place it on the battlefield. If you cannot place your new summon, the issue is capacity rather than a failure of the summon mechanic itself.

Your ability to deploy units is governed by your active formation limits, specifically your Altar Slots or Population. If you have reached your maximum capacity, you must make a decision:

Replace an existing unit: Send an active minion back to your inventory to free up capacity for the new summon.
Increase permanent capacity: Focus on leveling your skill tree or unlocking upgrades that permanently expand your Altar Slots or Population.

Before starting a long auto-roll session, always check your current capacity limits to ensure you have room for any new units you plan to deploy immediately.

Capacity Type	How It Affects Summoning	How to Resolve Limitations
Altar Slots	Restricts the total number of unique units you can manage	Swap out underperforming units or upgrade slot capacity
Population	Limits the total number of active minions deployed	Clear space by removing older units or check the skill tree for upgrades

Evaluating and Testing New Minions

Summoning a high-rarity minion does not automatically mean it should replace a unit you have already leveled. A well-leveled starter unit will often outperform a base-level rare unit until the new unit is properly upgraded.

When you roll a new unit, use the following evaluation steps before changing your formation:

Check the Unit Index: Update 1 introduced a Unit Index where you can view unit profiles, mutations (such as the Demonic mutation), and base stats.
Compare Level and Upgrades: Compare the new unit's base stats with the stats of your current leveled defenders.
Analyze the Role: Ensure the new minion fits the specific defensive needs of your current wave layout.
Perform a Test Run: Place the unit and run a test wave. If it underperforms, review its level and upgrade path before deciding to invest scarce Fusion Shards into it.

Keep in mind that Update 1 also introduced features like Gold Rush, Shard Storm, and Cursed Moon. Always check the live in-game UI to see how your new summons interact with these active game states.

Evaluation Metric	What to Look For	Action
Base Stats	Damage and range compared to active units	If base stats are lower, prioritize leveling the new unit first
Mutations	Special status like the Demonic mutation	Keep mutated units for specialized defense roles
Resource Cost	Fusion Shard investment required	Save shards for units that show clear utility during test runs

Frequently Asked Questions

What currency summons minions?

Souls are used to summon minions at the Summon Altar in public gameplay. You collect Souls as drops by defeating waves of attacking heroes. Coins are not used for altar rolls.

Does the game have auto-roll?

Yes, the game features a built-in auto-roll option. You can configure this option in the Summon Altar interface to stop rolling automatically when you obtain a unit that meets your selected rarity target.

Why can I not place my new minion?

If you cannot place a newly summoned minion, your active formation has likely reached its placement limit, which is governed by your Altar Slots or Population. You must either replace an active unit or increase your permanent capacity limits.