- Precursor tags are assigned to systems on galaxy creation; You can only start a precursor in a system with its tag (and for the five original precursors, ALL of their anomaly sites are found only in systems with their tags). You can only see these tags in debug mode.
- There is an equidistribution of tags, nicely parceled out in regions. Systems bordering two regions are often assigned both tags. (And in a few cases I've seen three tags at a triple intersection.) So all else being equal, a system is as likely to have the Zroni tag as any other specific precursor.
- But all else is definitely unequal when it comes to finding the first Zroni digsite.
- Whenever you survey an object in a system that has one or more precursor tags, and you don't have a precursor assigned yet, you have a chance of being assigned the tag's precursor if the object you surveyed is valid for that precursor
- Zroni has by far the most restrictive choice - it can ONLY be activated when surveying a habitable planet (without preexisting anomaly or archaeological site)
In other words, if you do a normal efficient surveying:
a) If you start in a region where there are no Zroni tags nearby, you won't get the Zroni precursor, obviously. No different from any other precursor.
b) If your starting neighbourhood has Zroni tags nearby and some other precursor tags (the most common situation that could conceivably give you Zroni), odds are that you'll find the other precursor first unless you both a) get lucky and search the Zroni tagged systems first, and b) are lucky that the Zroni tagged systems have planets, and c) get lucky when searching the planets.
c) If your starting neighbourhood has Zroni tags for 2-3 jumps in every direction, and no or minimal overlap with other border regions, you have a pretty good chance of getting Zroni. This is not a common situation, and even then, you'll only have a handful of eligible survey objects, the habitable planets, and the further away your survey the more likely you are moving out of the Zroni region.
So if you want to find Zroni, survey systems with habitable planets first, or even better but perhaps excessive micromanagement, survey habitable planets first. Fundamentally,
It is a completely wasted effort if you start in a region with no Zroni tags (i.e. most of the galaxy). But it will definitely increase your odds of getting the Zroni precursor in general.
ALTERNATIVELY, if you are willing to cheat and play on PC. On gamestart, activate the console. Type
debugtooltip - then swipe the cursor over nearby systems and check which precursor initializer tags they have. Then decide whether to restart or proceed based on your new knowledge. Type debugtooltip again to disable.