Undertale Adventures X Units List

Undertale Adventures X organizes its Units into six rarity bands, and the community wiki lists 76 entries across them. The roster runs from standard Ruins enemies like Froggit and Whimsun up through Mythical and Secret versions of Sans. This page reproduces the confirmed names, flags the one duplicate the wiki itself gets wrong, and explains what the rarity bands mean in practice.

• Six bands — Common, Rare, Ultra Rare, Legendary Rare, Mythical, Secret
• 76 entries in the community list, with one duplicate
• Summon currency — Souls
• Upgrades — traits and stats rolled in the lobby's Upgrades facility
• Caveat — the wiki page was last edited July 29, 2026, before the October update

Common Units

The Common band is the Ruins and Snowdin enemy roster, and it is where every account starts.

Nineteen entries. A few of these names matter more than their band suggests: Vulkin, Tsunderplane and Heats Flamesman were added to the Hotlands banner later than the original roster, which is why they sit in the lowest band despite coming from a late area.

Rare Units

Twelve entries. This is the band where you start seeing Units that can anchor an early team rather than simply fill a slot.

Ultra Rare Units

Thirteen entries. Ultra Rare is the first band with recognisable boss-adjacent characters — Flowey and Mettaton both appear here, with Mettaton EX and Mettaton NEO sitting in higher bands.

Legendary Rare Units

Eleven entries. This is the band that carries most mid-game teams: Toriel, Papyrus and Undyne are all here, and all three are the kind of Unit players build around rather than slot in.

Mythical Units

Seven entries. The Mythical band is almost entirely Sans variants plus Gaster, which fits the game's source material: the endgame is a skeleton problem.

Secret Units

Fourteen entries, with a caveat: Moldessa appears in both the Rare and Secret sections on the community wiki. That is a wiki error, not a game feature. Either Moldessa has a Secret variant that should have been listed under a different name, or the row was duplicated. Do not plan around it until you see it in game.

The Secret band is where the alternate-universe Sans variants live, and several of the names — Aftertale, Dust Dust (Cosmic), Possession Sans (Overgrowth) — read as event or boss-drop Units rather than standard summon results. The Corridor page confirms that at least one Secret-tier Unit, Dust Sans (Corridor), is a 10% spawn after killing the Sans boss on Genocide, so boss drops are a real acquisition route.

How Summoning Works

Summoning costs Souls. The older wiki for this game states 50 Souls per pull, with the pool split across Ruins, Snowdin, Waterfall and Hotland banners. The current build still uses Souls as the currency, and the game's own description names Units and traits as the two progression axes.

A few structural notes that are safe to rely on:

• Region-linked banners. The wiki describes pulling from area-specific pools, which is why Units from Hotland can appear alongside Units from Ruins in the same account.
• Duplicate handling. The wiki maintains a separate "Units2" page, which is the usual structure for a game that has duplicate-based upgrades or evolutions. The exact conversion is not published.
• Evolution items exist. The Items page has a dedicated Evolution Items category alongside Equips and Upgrade Items, so some Units have an evolution path.

Rarity Is Not the Same as Strength

A higher band does not automatically beat a lower one. In a tower defense game, what matters is role fit: a Common economy Unit that doubles your early income can be worth more than a Mythical damage Unit you cannot afford to place.

The practical way to read this list is by role, not by band:

• Anchor damage — the Unit you upgrade first. Usually Legendary Rare or above.
• Support — buffs and control. Often Ultra Rare, and often the difference in a boss fight.
• Economy — accelerates income. Frequently lower band, frequently underrated.
• Coverage — area damage for crowded waves.

The tier list ranks the top bands, and the traits guide explains how a trait can move a mid-band Unit above a high-band one.

What the Game Does Not Publish

Three things are missing and are not invented here:

• Stat blocks. No damage, range, attack speed or DPS numbers are available for any Unit.
• Summon rates. The rarity bands are listed, but the probability of each band on a pull is not published.
• Trait tables. Traits exist and can be rolled, but the trait list and their effects are not documented.

Any page that prints exact DPS numbers for this game is guessing. The correct way to evaluate a Unit in the current build is to field it, watch a wave, and compare.

Sources and Further Reading

• The roster this page is built from: the community wiki's unit roster
• The current code payout and its status: GamesRadar's Undertale Adventures X code page

Official source: Undertale Adventures X on Roblox — the official description confirms the Undertale unit roster and the trait upgrade path.

Frequently Asked Questions

How many Units are in Undertale Adventures X? The community wiki lists 76 entries across six bands, with one duplicate. The true current count is likely higher after the October update.

What are the rarity bands? Common, Rare, Ultra Rare, Legendary Rare, Mythical and Secret.

What is the best Unit? The game publishes no stats. Community consensus puts Sans variants, Asriel, Mettaton NEO, Undyne and Papyrus at the top, but there is no official ranking.

How do you get Secret Units? Mixed routes. Some appear to be summon results and at least one — Dust Sans (Corridor) — is a 10% boss spawn on Genocide.

Do duplicates matter? The wiki's separate Units2 page and the Evolution Items category both suggest yes, but the conversion is not documented.

Where do I upgrade a Unit? In the lobby's Upgrades facility, where traits and stats are rolled.