- Undertale Adventures X best starter units are the accessible, reliable units that carry early Ruins and Snowdin stages.
- Core roles first: secure one dependable damage unit, one coverage unit, and one economy unit before anything else.
- Placement matters: position units where they attack enemies for the longest possible time.
- Save resources: avoid investing all currency into a single unit too early.
- Trait later: only spend trait resources after your core team is stable.
What Makes a Good Starter Unit in Undertale Adventures X
Undertale Adventures X is a Roblox tower defense game by Side Productions where players deploy Undertale-themed units to defend their base, clear regions such as Ruins, Snowdin, Waterfall, Hotland, and Core, and upgrade units mid-run. Because early currency is limited, the difference between a smooth start and a frustrating one usually comes down to which units you level first.
A starter unit earns its slot by satisfying three conditions at once:
| Criteria | Why It Matters | What to Look For |
|---|---|---|
| Reliability | Early stages need consistent clears, not burst | Simple attack pattern, dependable damage every wave |
| Upgrade efficiency | Stage income is tight in the first regions | Low cost per meaningful upgrade level |
| Coverage | Enemies follow fixed paths | Long attack range or area/multi-target attacks |
| Longevity | Avoid rebuilding your whole team later | Stays useful through Snowdin and Waterfall |
Do not chase rare pulls in your first sessions. A common unit upgraded twice usually outperforms an un-upgraded rare unit in the Ruins region.
Starter Unit Roles Compared
The source data for Undertale Adventures X organizes units into functional categories. When evaluating your early roster, judge each unit by its category rather than rarity alone.
Damage Units
- Primary enemy damage
- Direct attacks on single or few targets
- First upgrade priority in almost every stage
- Best placed at path bends for maximum uptime
Area-Coverage Units
- Multi-target patterns: splash, piercing, area hits
- Excel against dense waves in Snowdin
- Pair with a single-target damage unit
- Upgrade expands coverage and group damage
Support & Economy Units
- Accelerate early income or buff the team
- Enable faster first upgrades
- Support effects: slows, debuffs, control
- Lower personal damage, high team value
The recommended early-game team shape is simple:
| Team Slot | Role | Early Priority | Upgrade Order |
|---|---|---|---|
| Slot 1 | Damage dealer | High | Upgrade first, every stage |
| Slot 2 | Area coverage | High | Second upgrade once waves thicken |
| Slot 3 | Economy/income | Medium | Deploy early, upgrade only if income stalls |
| Slot 4 | Support/control | Low-Medium | Add when bosses or fast enemies appear |
Spreading upgrades across every deployed unit is the most common way new players lose stages. Concentrate stage income on your best one or two damage sources, and only broaden after the stage is stable.
Step-by-Step: Building Your First Team
Follow this sequence during your first hours in the game. It mirrors the core loop — deploy, clear, collect, upgrade, and then enhance traits.
Deploy Your Initial Team
Enter the earliest Ruins stage and place available units where they cover the main enemy path for as long as possible. Use deployment slots efficiently and keep some currency reserved for the next upgrade.
Upgrade the Most Useful Units
Spend stage income on the unit contributing the most to clears. Upgrade reliable damage sources first; improve support or utility units only when the stage demands it.
Earn Resources Through Stages
Replay stages you can clear consistently and collect all available rewards. Repeatable early content funds your first real progression goal without wasting summon resources.
Push Harder Regions
Once damage and coverage are sufficient, advance into Snowdin and beyond. Adjust placement when enemy pressure increases, and reposition units that lose attack opportunities.
Invest in Traits
Only after your team is stable, spend on traits and enhancements for units you use across multiple stages. Avoid rare trait resources on temporary units.
If you can clear a stage twice in a row without a unit dying or the base taking heavy damage, your starter team is ready to advance to the next region.
Traits and Summons for Starter Units
Traits amplify what a unit already does well, so match the trait direction to the unit's role before rerolling anything.
| Unit Category | Preferred Trait Direction | Keep a Trait When | Reset When |
|---|---|---|---|
| Damage dealers | Attack speed, damage consistency, range | The unit is core to your active team | Trait only boosts economy/support value it can't use |
| Area-coverage units | Multi-target damage, wider coverage | It improves wave-clear reliability | Coverage gain is negligible in your current stages |
| Support units | Effect uptime, range, reliability | Effect lasts longer or reaches more enemies | Trait only raises personal damage |
| Economy units | Income speed, early contribution | You use it at stage start every run | Unit no longer needed for farming |
For summoning, treat shards and soul-type resources as limited progression currency. Identify your roster gap first — missing damage, missing coverage, or missing economy — then summon with that role in mind instead of pulling repeatedly without a team-building goal. Favor new units that fill a gap over duplicates until your core team is complete.
Save summon resources when your current roster already clears the content you need and a better banner or event is expected. Build one dependable team before investing in duplicates.
Starter Progression Checklist
Use this checklist across your first sessions to confirm your account is on track:
Early Game Milestones:
- Clear the Ruins region with a stable team
- Upgrade one primary damage unit fully in early stages
- Add one area-coverage unit before Snowdin waves
- Establish a repeatable stage for currency farming
- Keep enough currency reserved for mid-run upgrades
The five regions currently available — Ruins, Snowdin, Waterfall, Hotland, and Core — gradually reward scaling damage and wider coverage, so units that only clear low-density waves tend to fall off in Hotland and Core. Plan replacements before you reach those regions rather than after a failed run.
FAQ
Q: What are the best starter units in Undertale Adventures X?
The best starter units are accessible damage and area-coverage units with low upgrade costs and dependable attack patterns. Judge early units by reliability and upgrade efficiency rather than rarity, and prioritize one strong damage dealer, one coverage unit, and one economy unit as your core three.
Q: Should I upgrade one unit or spread upgrades across my team?
Concentrate stage income on your best one or two damage sources first. Spreading upgrades across every deployed unit is a common early mistake that leaves the team too weak against stronger waves in later regions like Waterfall and Hotland.
Q: When should I reroll traits on starter units?
Wait until the unit is established in your main team and the current trait conflicts with its role. For example, reset an economy-only trait on a primary damage dealer, but keep generally useful traits while your roster is still developing to preserve resources.
Q: Can starter units stay useful in later regions?
Some can. Units with strong scaling, long range, or useful multi-target coverage often remain valuable into Hotland and Core. Units with limited scaling are usually replaced, so avoid spending rare upgrade and trait materials on them.