Lucenite is the abundant yellow primary resource in SAROS, and is used to unlock most of the nodes in the Armor Matrix. While widely available on Cycles, you will be in need of large quantities of Lucenite as you seek to improve your stats and abilities, including those which have a bearing on Lucenite collection itself.
This SAROS guide is all about how to quickly and efficiently farm for Lucenite.
World Pickups
Lucenite is plentiful right out in the open, and you will stumble upon it on both the main and side paths. However, there can be a lot more hidden out of sight, whether in elevated locations, obscured by other objects, or behind barriers. If you have the inclination, be sure to look in every nook and cranny where secrets might potentially lie.
Grinding the same biome is also an option, and in fact might be the only way to max out progression until the next biome is cleared.
Golden yellow Containers can potentially supply you with a significant infusion of Lucenite, but require Carcosan keys in order to crack them open. The keys themselves are a limited resource found in white Containers with a relatively low chance to spawn themselves, and you might want to save them for gates instead. The Armor Matrix has several Key Storage upgrades that allow you to start runs with keys in hand, up to a maximum of five.
Farming Enemies
Enemy drops are an obvious source of Lucenite, however, those drops can disappear in a matter of seconds. In order to avoid losing Lucenite like this, try to position yourself such that you can safely snap up the drops as soon as they appear, while avoiding taking damage from other enemies and hazards.
Aether Orb Conversion
Aether normally restores Armor Integrity, but will automatically convert to Lucenite if you happen to be at full Integrity already, which works as a nice bonus for avoiding damage.
Drive Attribute
The Drive Attribute increases Lucenite gain to allow faster Proficiency upgrading. While the permanent modifiers are applied through the Armor Matrix, you can also increase it temporarily during Cycles for the duration of a given run only.
Cycle Artefacts
Artefacts are a potential reward choice when cracking open Containers. While Halcyon should be top priority when making a decision there, any Artefacts that can boost Lucenite gains come in a very close second. Item attributes can affect gathering either indirectly through raising the Drive attribute, or directly increasing Lucenite gain itself.
Bear in mind that these Artefacts exist only for the duration of the Cycle, so make the most of it while you can.
Tangential Lucenite Upgrades
These Armor Matrix upgrades are a matter of return on investment of your Lucenite, wherein you spend resources in order to increase or improve your Lucenite collection bonuses going forward. You should prioritize these as early as possible for best effect, especially those related to enlarging drops from enemies and the lifetime of those drops before despawn.
The latter is especially critical as dropped Lucenite tends to despawn quite quickly without it, making some battles a matter of bearing the risk of chasing the Lucenite while tanking damage from any remaining enemies.
Lucenite Saver is an Armor Matrix upgrade that you may want to look into spending Halcyon on, especially if you tend to die a lot on Cycles. With an initial penalty of 50% to your Lucenite pool, any further amount you can preserve upon death will be of benefit to you in the long run.
Those are all the ways to farm for and save Lucenite in SAROS.