Traits are the modifiers you stack onto units in Universal Tower Defense, and they decide whether a carry shreds bosses or just tickles them. Each unit can hold up to two traits, but you only change them through random rerolls, so picking the right target before you spend a single scroll matters more than grinding more units.
Universal Tower Defense trait tier list
Rankings reflect how much a trait raises a unit's real output across Infinite, Virtual Realm, and boss content. The top tier offers balanced or DoT-focused buffs that fit most carries, while the bottom tier only nudges a single stat.
| Tier | Traits |
|---|---|
| S | Astral, Artificer, Eternal, Fission, Sacred, Wizard |
| A | Deadeye, Duelist, Lethal, Lightspeed, Ruler |
| B | Fortunate, Prodigy, Precise |
| C | Agile, Enhanced |
Ruler is the strongest single buff on paper, but it locks a unit to one placement, so it sits a notch lower for general use and shines only when you build one super-carry for boss and raid modes. Fortunate looks low here because it only helps farm units, where it is actually mandatory.
Trait effects and drop rates
Every trait has a fixed pull chance. The rarer it is, the longer the grind, so weigh the buff against the odds before committing scrolls to a specific unit.
| Trait (Drop Rate) | Effect | Notes |
|---|---|---|
Ruler (0.1%) | +200% Damage, −20% Cooldown, +30% Range, +20% Income, 1 placement limit | Huge damage and cooldown gains; best on a single boss carry |
Fission (0.15%) | +15% Damage, −15% Cooldown, +25% Range, adds Radiation DoT | Balanced buff with bonus damage against high-HP enemies |
Eternal (0.2%) | −20% Cooldown, +5% Damage per wave, +2.5% Range per wave (caps +60% Damage, +30% Range) | Scales hard into late waves; weak early |
Sacred (0.3%) | +25% Damage, −10% Cooldown, +25% Range, −15% Cost | Well-rounded boost that fits any unit type |
Astral (0.45%) | +20% Affliction Duration, −20% Cooldown, +15% Range, DoT stacks, 1 placement limit | Best for DoT carries; stacking afflictions melt bosses |
Wizard (0.5%) | +30% DoT Damage, −15% Cooldown, +20% Range | Strong on magic and DoT units; pointless on non-DoT units |
Artificer (0.65%) | Increases stats gained from relics | Scales with relic investment; needs relic grinding to pay off |
Duelist (0.8%) | +25% Critical Rate, +20% Range, +35% Boss Damage | Excellent against bosses and elites; weaker in normal waves |
Fortunate (Farms only) (1%) | +20% Income | Only useful on farm units like Fastcart |
Lightspeed (1.5%) | −20% Cooldown | Noticeably faster ability spam, but one stat only |
Deadeye (2.5%) | +20% Range | Solid range bump, but one-dimensional |
Lethal (5%) | +15% Critical Rate, +30% Damage to enemies at ≤50% HP | Good crit boost; bonus damage is situational |
Prodigy (9.99%) | +50% Unit Experience | Speeds up leveling for evolutions; no combat value |
Precise (Tier III) (24.98%) | + Range | Small range gain; ignores damage and cooldown |
Agile (Tier III) (24.98%) | − Cooldown | Small cooldown cut; basic filler |
Enhanced (Tier III) (29.67%) | + Damage | Small damage scaling; nothing standout |
How to reroll traits in Universal Tower Defense
Rerolling happens at a dedicated building in the main square, the one with a large "Traits" sign on the front. You spend Reroll Scrolls each time, and the result is random, so commit them only to units you actually plan to use.
Step 1: Open the upgrade building marked "Traits" in the main hub and talk to the NPC at the counter. Choose the trait option to start the reroll menu.
Step 2: Select the unit you want to roll on. A unit with no trait gets one assigned on the first roll, while a unit that already has a trait will have it replaced.
Step 3: Press reroll to consume a scroll and roll a new trait from the pool. Keep going until you land your target, or until you hit your scroll budget.
Where to get Reroll Scrolls
Scrolls are a limited resource, so steady collection beats waiting for a single big drop. These are the reliable sources to clear regularly.
| Source | Reward |
|---|---|
| Level milestones | 10 rerolls per level |
| Featured Challenge | Trait Rerolls x5 (30% drop) |
| Gold Shop | Buy rerolls when you can afford them |
| Achievements | Various reroll rewards |
| Active codes | Free rerolls on redemption |
Clear the Gold Shop daily, farm the Featured Challenge once your team is geared, and redeem any current codes for a quick top-up before you start a serious reroll session.
Realistic reroll odds and expected cost
The expected number of rerolls is roughly 100 divided by the drop rate. That is an average, not a guarantee, so plan for streaks of bad luck on the rarest traits.
| Trait | Drop Rate | Expected Rerolls |
|---|---|---|
| Ruler | 0.1% | ~1,000 |
| Astral | 0.45% | ~222 |
| Sacred | 0.3% | ~333 |
| Duelist | 0.8% | ~125 |
| Fortunate | 1% | ~100 |
For the rarest target, the spread is wide. A 50% chance at Ruler-class odds can take well over a thousand rerolls, and reaching a 95% chance can run several thousand. If a roll for one elite trait stalls, a common backup move is to stop on the next-best result you hit along the way, such as Astral, Wizard, or Artificer, rather than burning your entire stockpile chasing one unique trait.
How to confirm the reroll worked
Success shows on the unit card immediately. The trait name updates the moment the roll resolves, and the unit's stat tooltip reflects the new buffs once it is placed. If nothing changes, the most common cause is having no Reroll Scrolls left, so restock from level milestones or the Featured Challenge before trying again.
Spend your early scrolls on Fortunate for a farm unit to grow your economy, push mid-game rolls toward Duelist or Sacred on your main carry, then save your largest reserve for a single elite trait once you know which unit will anchor your team. You can jump straight into a session from the Universal Tower Defense Roblox page whenever your scroll count is high enough to make the grind worthwhile.