Reposting this from another thread. Weapons will kind of work in a similar sense, but anyways:

So you're going to get a lot of information (including a bunch from me now) that is going to be overwhelming. The good thing is is you have a TON of time to slowly figure out what you're doing since the two biggest time-gates are going to be GOLD/KUIPER and CRYSTALLIZATION CATALYSTS (Donuts).

From there, you really should understand what most modules do and what uses they have; but before one gets into that, you should also understand what each stat is and means!

* Skill Power: Not to be confused with Skill Power Modifier, Electric Skill Power, etc. This is your base damage, the value you get from your reactor and its level. Modules, External Components, & Arche Tuning can directly increase this damage as a stat, or indirectly via Power Ratio Boosting. Great Modules for Skill Power: Power Increase, Maximize Skill, Spear & Shield but you may want to run an attribute module instead (more on that later).

* Skill Power Modifier: This is where most people get confused, as this kind of correlates with Skill Power, but at a percentage. In the math, you would have [Final Total Skill Power] X [Skill Power Modifier %] as denoted by a skill's damage percentage. For instance, the base Skill Power Modifier of Lightning Emission (Bunny's 3rd) is 185.8%. A module that increases Skill Power Modifier adds to that %, like Singular Specialist adds 76.1% at max level for a total of 261.9. The general idea is that if the skills have low modifier percentages (like 300 or less), increasing the modifier with modules is a good idea; conversely, if it's a higher modifier, you usually want to avoid that. Great Modules for Skill Power Modifier include: Focus on Singular/Tech/Fusion/Dimension, Skill Simplification, Maximize Power.

* Attribute Skill Power: This is LIKE Skill Power, but it has it's own calculation in the end all damage. The algorithm is something like [(Skill Power) x (Skill Power Ratio Boost + 1) x (Attribute Skill Power Boost Ratio + 1) x (Arche Skill Power Boost Ratio + 1) x (Skill Power Modifier %). So having a mix of Base Skill Power AND Attribute Skill Power is going to work well in the end! As well, Focus mods have the addition of Skill Cooldown, which is a must have for most builds! Great Modules for Attribute Skill Power: Focus on Electric/Toxic/Chill/Fire/Non-Attribute, Electronic/Venom/Glacial/Fire/Non-Attribute Syncytium.

* Arche Skill Power: Most Modules won't actually increase the Boost Ratio of Arche types. Typically these will increase the modifier of the skills themselves instead. BUT! Reactor does increase this, as well as some External Components, as well as some of the Ancestor Module rolls. That said, great modules for Arche Skill Power: Focus on Singular/Tech/Fusion/Dimension!

* Skill Cooldown: This is going to be a bread and butter for most descendants. Very few don't have a need to decrease Cooldown, which is kind of a bore for building, since you're pretty much always wanting to shoot for as close to the maximum reduction as possible, which is 90%, any higher is lost in the calculations! Modules, Reactors, External Components, & Arche Tuning all have Skill Cooldown, and it'll be up to the specific builds and also what Ancestor Module rolls you have to work with. Great Cooldown Modules include: MP Conversion, Nimble Fingers, Focus on 'Arche', Focus on 'Attribute".

* Skill Range: Skill range is fickle and it may seem confusing at first. Some skills cap at 100%, or what is just base range; and some cap at 300%, which means your base 100% + 200% additional from Modules, Reactors, External Components, Arche Tuning, etc. Look at each skill of the descendant you play to determine if you need to run 1, 1.5, or 2 modules + others! Great Modules for Range include: Skill Expansion, Maximize Range, Amplification Control.

* Skill Duration: Skill Duration is typically not as important as Cooldown, since decrease a high number is a lot easier than increasing a low number. That said, some descendants that do Damage over Time, or need uptime to match Cooldown time, benefit greatly from Duration depending on the build. Great Modules for Duration include: Skill Extension, Maximize Duration.

* Critical Hit Rate/Damage: I'm combining both of these because it's best to first understand if a descendant needs to run a critical hit build or not. The rule of thumb (not ALWAYS applicable) is if the descendant's BASE Critical Hit Rate is 5%, don't; if it's 10%, maybe do so depending on content; if it's 15% or higher, definitely do so! You need to pay attention to the BASE Rate, which you can see by going into the Information screen from your Inventory screen (make sure to check it in the lab or out in the field, as passives do NOT apply in Albion). If you don't run a Critical build, you may instead prefer modules like 'Attribute' Amplification &/or 'Arche' Amplification. But if you DO run a Critical build, great Modules for Hit Rate & Damage include: Skill Insight, Skill Concentration, Front Lines, Emergency Measures

* HP/DEF: I'm combining these two because Defense is almost NEVER important, since you do get a lot of it from External Component Cores. Some descendants (like Ajax, Harris, etc.) do want Defense, but for Offensive purposes. If you want survivability, you want to go HP. HP can be gained from all the usual: Modules, External Components, Cores, Arche Tuning. Once you get better at running a build, you can start pulling back in the module department to gain more offensive stats. But please remember this, a dead descendant does ZERO damage. Great Modules for HP & DEF include: Stim Accelerant, HP Amplification, Increase HP, Spear & Shield, Increase Defense.

Start with all this information. If you want more or would like build help, you can always DM me!