Rarity and evolution are two different things, and nearly every Universal Tower Defense Z guide mixes them up
Ascension, Boundless and Phantom are evolution stages. Mythic, Legendary, Epic, Rare, Secret and Exclusive are rarities — a separate column in Pro Game Guides' unlock table. Guides for Universal Tower Defense Z routinely collapse the two fields into one, and players lose progress acting on it.
Open any Universal Tower Defense Z tier list and you will find a unit written as something like Cranium (Phantom). Read the guide underneath it and there is a decent chance the writer calls Phantom a rarity. It is not. It is an evolution stage, and the difference is not pedantry, because one of those things you can work towards and the other you cannot.
Two fields, not one
The game tracks both.
Rarity is what a unit is. It is a separate field, the familiar Roblox gacha axis, describing how hard the unit is to obtain rather than how far you have taken it. It is also a literal column: Pro Game Guides' post-4.0 tier list carries a "Rarity / Unit" column in its UTDX Unlock and Evolution Table. Reading down that column on 14 July 2026, six values appear:
Mythic (25 rows), Secret (15), Exclusive (13), Legendary (8), Rare (7), Epic (5). A fair number of rows read "Rarity TBA", which is the table saying it does not know yet — and which is a good sign about the table, not a bad one.
Mythic gets a second, independent confirmation from an odd direction: it appears in the reward text of the live code WeLoveUTDZ! ("12 Mythic Etherealization Shards"), published by four separate code trackers.
Evolution stage is what a unit became. It is the word in brackets after the name. Ascension. Boundless. Phantom. Unrivaled. Genius. It is the output of the Evolve system, which means a unit you already own can reach it.
One is an origin. The other is a destination. Guides that print them in the same sentence, in the same style, with the same colour treatment, quietly teach you that they are the same axis, and once you believe that, you make worse decisions.
What the confusion costs you
Two specific mistakes, and I have watched both happen in Discord threads.
The first is skipping a unit because its bracket looks unimpressive. If you read the bracket as a rarity band, a unit with no bracket at all reads as the bottom of the pile. It is not. It is a unit that has not been evolved yet, which is a completely different statement, and it might be a Mythic sitting one system away from being the strongest thing in your roster.
The second is chasing a bracket you could have earned. If you think Ascension is a rarity, then the only way to get an Ascension unit is to pull one. So you spend. And you spend against a category that does not exist, when the actual route to that label ran through a system you already had access to.
Both mistakes cost real resources, and both are downstream of one sloppy sentence in a guide.
Why so many guides get it wrong
I want to be fair about this, because it is an easy error to make and I nearly shipped it myself.
The bracket labels look like rarities. They are capitalised, they sit right next to the unit name, they sound impressive, and other games in this genre genuinely do use words like that as rarity bands. If you are writing about the game from a spreadsheet of unit names rather than from playing it, there is nothing in that spreadsheet to tell you the bracket is a different field. So the error propagates, one guide copying the last, until it is the consensus.
The tell that a page has done this is usually the phrase "Boundless rarity", or a tier list where the bracket appears in the rarity column. Once you see it, you cannot unsee it.
The correction, in one line each
- The bracket after a name is an evolution stage. You can work towards it.
- Rarity is a separate field, with six values: Mythic, Legendary, Epic, Rare, Secret, Exclusive.
- A unit's rarity does not change when it evolves. It is the same unit, further along.
- Tier is a third thing again: it is somebody's opinion about how well the unit performs, including ours.
Correction, 14 July 2026
An earlier version of this post printed the rarity list as "Mythic, Legendary, Epic, Secret and Exclusive". That was five values where the source has six: it omitted Rare, which appears in seven rows of Pro Game Guides' table. That omission is the one genuine error, and it is fixed above.
What happened next is the part worth telling. An audit of this site — a good and necessary audit, which caught real fabrications elsewhere — briefly concluded that the whole rarity list was invented, on the grounds that Pro Game Guides "has no rarity column". A retraction to that effect went up on this page for a few hours.
It was wrong. The column is there. The reason the audit thought otherwise is that the Pro Game Guides page is about 870KB, and the tool used to read it summarised the page rather than searching it, and the summary did not mention a rarity column. Nobody lied. A machine said "I did not see it" and a human heard "it is not there".
So the retraction has itself been retracted, and the lesson is a rule rather than an apology:
"I could not find it" is much weaker evidence than "it is not there."
They feel identical from the inside, and they are not remotely the same claim. Publishing a false retraction is worse than publishing nothing, because a correction carries the authority of someone who has checked, and a reader has no way to know that the checking was done by a summariser that had already given up.
What survives all of this intact is the thing the post was actually about: rarity and evolution are two different fields, and reading a bracket as a rarity band will cost you resources. That was right the first time.
What we still do not publish
We do not play this game. Nobody here has an account in it, and any page telling you it personally tested a Roblox game this morning is telling you something you cannot check. What this site does is compile and cross-check what independent guides and trackers publish, and name them.
So there is no unit-by-unit rarity mapping on this site, and no evolution cost table. The rarity column exists and we have read the values out of it; we have not transcribed it row by row, and a half-filled rarity field on 116 unit pages would be worse than an absent one, because it would imply we had checked every unit when we had checked some. That is a gap in our work, stated plainly, and it is a different thing from a gap in the sources.
If you want the practical version rather than the taxonomy, the first-hour guide covers what to spend on and in what order, and the Evolve page is where the bracket labels actually come from.