Undertale Adventures X Tier List
Community consensus ranking for the Roblox tower-defense game. No official stats exist, so this is built from rarity bands, unit roles, and what endgame guides consistently name.
Community ranking · Oct 2026
Traits > rarity band
Working Codes →
Free summons and rerolls first, then build
The real ranking factor is traits, not the band. A well-traited A-tier unit beats a poorly-traited S-tier one — reroll traits at the lobby's Upgrades facility before judging a unit.
SEndgame anchors — build around these
Sans (Mythical)
Mettaton NEO (Secret)
Asriel
Undyne (Legendary Rare)
Papyrus (Legendary Rare)
ALegendary Rare band — carries mid-game teams
Legendary Rare units generally
F2P-reachable backbone of most accounts
BUltra Rare specialists worth keeping
Coverage / support Ultra Rares
Economy units
CCommons & Rares — stepping stones
Starter units until first Rare+ pull
Why these five sit on top
| Unit | Why |
|---|---|
| Sans (variants) | Occupies the entire Mythical band — the highest summonable tier. Any pull here is an anchor. |
| Mettaton NEO | Secret band — among the rarest obtainable units in the game. |
| Asriel | Named top-tier by community guides; absent from the wiki's older roster — newer addition. |
| Undyne / Papyrus | Legendary Rare — the strongest band a free account can realistically reach. |
Trait rolls — the actual endgame
12 traits, rolled at the lobby's Upgrades facility. These decide whether a unit performs.
| Trait | Chance | Effect |
|---|---|---|
| Determination | 0.1% (1/1000) | +50% damage, -25% attack cooldown |
| Kindness | 0.5% (1/200) | -25% attack cooldown, +15% range |
| Perseverance | 0.7% (1/143) | +20% range, +20% damage |
| Integrity | 1% (1/100) | -25% deploy cost, -15% upgrade cost |
| Bravery | 1.5% (1/66) | -30% attack cooldown, -5% range |
| Justice | 2% (1/50) | +27.5% range, -2.5% damage |
| Patience | 3% (1/33) | +25% damage, +10% cooldown |
| Boss Soul | 5% (1/20) | +10% damage, -10% deploy cost — solid mid target |
| Royal Guard Soul | 15% (1/6) | -5% attack cooldown |
| Monster / Ghost / Dog Soul | 30/25/20% | Cost or range minor — early-game rolls |
Roll priority: damage dealers first (they decide whether waves die), then economy units, then coverage. Don't burn rerolls on commons — save for a unit you're keeping.